Side Dishes
This sweet potato casserole recipe without sugar delivers all the comfort of a classic dish—creamy, spiced filling topped with nutty crunch—without any refined sugar. The secret lies in balancing natural sweetness from roasted sweet potatoes with warm spices like cinnamon and nutmeg, plus a touch of maple syrup for depth. It’s the perfect side for holiday meals or weeknight dinners when you want flavor without the sugar crash.
The velvety filling gets its richness from Greek yogurt and a splash of coconut milk, creating a texture that’s smooth yet satisfying. Topped with a crunchy pecan and oat streusel (sweetened only with a hint of maple syrup), this casserole has layers of flavor and texture that make it irresistible.
Baked until golden and bubbly, it’s the kind of dish that disappears faster than you can say "second helping."
What makes this recipe work is the careful balance of spices—cinnamon, nutmeg, and a pinch of cloves—to enhance the natural sweetness of the sweet potatoes.
The streusel topping adds a satisfying crunch that contrasts beautifully with the soft filling, while the maple syrup ensures just enough sweetness without overpowering the dish. It’s a healthier twist that still feels indulgent.
Ready in about 45 minutes, this casserole is perfect for feeding a crowd or prepping ahead for busy weeks. Serve it warm with a dollop of whipped cream or a scoop of vanilla ice cream for the ultimate comfort food experience. Here’s how to make it—simple, foolproof, and completely sugar-free.
Ingredients for sweet potato casserole recipe without sugar
Six ingredients for the filling, six for the crunchy topping—all sugar-free but packed with flavor.
| Ingredient | Amount | Notes |
|---|---|---|
| Orange Sweet Potatoes 🍠 | 3 lbs | Medium-sized, peeled and cubed |
| Plain Greek Yogurt 🧀 | 1 cup | Full-fat for creaminess |
| Coconut Milk 🥥 | ½ cup | Full-fat canned for richness |
| Pure Maple Syrup 🍯 | ¼ cup | Grade B for robust flavor |
| Ground Cinnamon 🌿 | 2 tsp | Freshly ground preferred |
| Ground Nutmeg 🌿 | 1 tsp | Freshly grated if possible |
| Ground Cloves 🌶️ | ½ tsp | Use sparingly for warmth |
| Salt 🧂 | ½ tsp | Kosher or sea salt |
| Pecans 🥜 | 1 ½ cups | Chopped, toasted for crunch |
| Old-Fashioned Rolled Oats 🌾 | 1 cup | Quick or old-fashioned |
| Light Brown Sugar 🍚 | ¼ cup | Packed tightly |
| Melted Coconut Oil 🫒 | ½ cup | For streusel binding |
| Vanilla Extract 🥛 | 1 tsp | Pure alcohol-free preferred |
| Unsalted Butter 🧈 | ½ cup | Cold, cubed for streusel |
Sweet potatoes are the heart of this dish, so choose ones that are vibrant and firm—orange varieties have the best natural sweetness. Trader Joe's or Costco usually have the best-priced organic sweet potatoes, but any medium-sized ones work. Peeled and cubed evenly, they roast up perfectly. The Greek yogurt adds that creamy texture without dairy heaviness—full-fat is worth it here for that velvety finish. For the spices, Penzeys or local spice shops carry freshly ground cinnamon and nutmeg that make a world of difference compared to the dusty stuff in grocery bins.
No maple syrup? Date syrup or mashed banana works in a pinch, though maple gives that perfect depth. Swapping pecans for walnuts or almonds keeps it nutty but changes the texture slightly. The oats? Quick oats work fine, but old-fashioned give that classic streusel bite. For the streusel, cold butter is key—don’t skip chilling it before mixing. And if you’re watching carbs, reduce the oats to 3/4 cup and add an extra 1/4 cup chopped nuts to keep the crunch.
Prep the filling and streusel separately—they keep well in the fridge for 3 days if you want to assemble ahead. The streusel stays crunchy for 5 days if stored in an airtight container. Bake it just before serving, though—nothing beats that fresh-from-the-oven crunch. Leftovers? Reheat in the oven at 350°F for 15 minutes to revive the streusel. Trust me, it’s worth the extra minute.
Why You'll Love This Recipe
- No-Sugar Guilt Trip: I swear, the maple syrup and cinnamon blend makes this taste like dessert—without the crash. The yogurt keeps it creamy without needing butter or cream.
- One-Pan Magic: Peel, cube, roast—done. The sweet potatoes caramelize right on the sheet pan while you mix the coconut-yogurt topping in a bowl. Less cleanup than my old marshmallow-heavy version.
- Weeknight Hero: Between us, this feeds a crowd but costs less than half of store-bought casseroles. The leftovers? Even better reheated—just microwave until the edges get crispy again.
- Sweet Without the Crash: Honestly, the orange sweet potatoes add natural sweetness that cuts the maple syrup’s intensity. It’s rich, warm, and satisfies that sugar craving—without the rollercoaster after.
Step-by-step instructions for sweet potato casserole without sugar
Here's how to create a velvety sweet potato filling with a nutty-spiced crunch—no refined sugar needed.
🍳 Step 1: Roast the Sweet Potatoes Until Tender
Preheat your oven to 400°F. Toss the 3 lbs orange sweet potatoes (peeled and cubed) with 1 tablespoon melted coconut oil and ½ teaspoon salt on a large baking sheet. Spread them in a single layer—this ensures even cooking and crispy edges.
Roast for 25-30 minutes, stirring once halfway through, until the sweet potatoes are fork-tender with slightly caramelized edges. You'll know they're done when they collapse easily under gentle pressure. Let them cool slightly before transferring to a food processor.
👨🍳 Step 2: Make the Creamy Filling
In the food processor, combine the roasted sweet potatoes with 1 cup plain Greek yogurt, ½ cup coconut milk, ¼ cup pure maple syrup, 1 teaspoon vanilla extract, 2 teaspoons ground cinnamon, 1 teaspoon ground nutmeg, and ½ teaspoon ground cloves. Process until completely smooth, scraping down the sides as needed.
Taste and adjust seasoning if needed—you might want to add a pinch more cinnamon or nutmeg for depth. Transfer the mixture to a mixing bowl and set aside. This step is where all the warm spices meld together for that signature fall comfort flavor.
🥘 Step 3: Prepare the Nutty-Spiced Topping
In a separate bowl, combine 1 cup old-fashioned rolled oats, 1.5 cups chopped pecans, ¼ cup light brown sugar, ½ cup cold cubed unsalted butter, and ½ teaspoon salt. Use your fingers or a pastry cutter to work the butter into the oat mixture until it resembles coarse crumbs with pea-sized butter pieces.
This texture is crucial—you want a streusel that's crunchy on top but still binds together when baked. If the mixture seems too dry, add 1-2 teaspoons melted coconut oil to help it hold its shape. Sprinkle the topping evenly over the sweet potato filling in a greased 9x13-inch baking dish.
🔥 Step 4: Bake Until Golden and Bubbly
Transfer the baking dish to a preheated 375°F oven and bake for 30-35 minutes until the top is golden brown and the edges are bubbly. The filling should be set but still slightly jiggly in the center—it'll continue thickening as it cools.
Here's the thing—don't overbake. You want that top to be crispy and caramelized, but the center should still have a velvety texture. If the top browns too quickly, loosely tent it with foil for the last 10 minutes of baking.
⏰ Step 5: Rest and Serve Warm
Remove from the oven and let the casserole rest for 10 minutes before serving. This resting period allows the layers to set properly and makes it easier to slice cleanly. The contrast between the warm, spiced filling and the crispy nut topping is what makes this dish special.
Serve warm with a dollop of Greek yogurt or a sprinkle of extra pecans. The natural sweetness of the roasted sweet potatoes shines through, enhanced by the warm spices and nutty crunch—all without any refined sugar. This casserole keeps well in the refrigerator for up to 4 days, making it perfect for meal prep or holiday gatherings.
Pro Tips For Making Sweet Potato Casserole Recipe Without Sugar
- ROAST THE POTATOES FIRST: I learned this the hard way—raw sweet potatoes in the casserole turn mushy and watery, no matter how much you drain them. Roast them at 400°F (200°C) for 20-25 minutes until fork-tender, then mash while still warm. The texture stays creamy, and the natural sugars caramelize just enough to deepen that orange hue without needing extra sweetness.
- WHISK THE YOGURT COLD: Sounds weird, but it works: mix the Greek yogurt into the coconut milk after both are chilled, not at room temperature. Warmth turns yogurt grainy, and that’s a texture you can’t salvage. Keep everything in the fridge until the last possible moment, then whisk vigorously for 30 seconds—this emulsifies the coconut fat properly, giving you a silky sauce instead of separation.
- SWAP MAPLE FOR CANDIED ORANGES: Pure maple syrup adds moisture but can make the casserole taste one-note. Instead, mix in 2 tablespoons of finely chopped candied orange peel (from a jar) for 1 tablespoon of syrup. The peel’s citrus oils brighten the dish, and the texture adds a pleasant chew—no extra sugar needed. Just drain it well first.
- BAKE UNTIL SET, NOT BROWNED: The top crust might look underdone, but resist the urge to crank the heat. Bake at 375°F (190°C) until the center is just firm—about 25-30 minutes after mixing. Overbaking dries out the yogurt base, and the coconut milk will curdle if you push it. A toothpick should come out clean, not sticky.
Flavor customization for this sweet potato casserole recipe without sugar
Spice Blend Variations
Swap the classic cinnamon-nutmeg combo for pumpkin pie spice (1 tbsp) to add depth with ginger and allspice. For a Mexican-inspired twist, replace nutmeg with ½ tsp smoked paprika and ¼ tsp cayenne—this adds warmth without sweetness.
I love using cardamom (½ tsp) for an exotic touch that pairs beautifully with the maple syrup. 🌶️
Sweetener Swaps
If maple syrup isn’t available, try date syrup (¼ cup) for a caramel-like flavor or mashed banana (½ cup) for natural sweetness and creaminess. For a lower-carb option, use erythritol or monk fruit sweetener (¼ cup), but reduce to 2 tbsp—it’s much sweeter.
I’ve also successfully used unsweetened applesauce (¼ cup) for a mild, fruity note.
Creamy Texture Adjustments
For a richer filling, replace half the Greek yogurt with sour cream (½ cup). If you prefer dairy-free, use coconut yogurt (1 cup) or silken tofu (½ cup blended) for protein.
I’ve found that adding 1 tablespoon cornstarch to the filling thickens it slightly after baking, especially if using extra coconut milk. 🥥
Topping Textures
For a gluten-free streusel, swap oats for crushed gluten-free graham crackers (1 cup) or almond flour (½ cup). Add ½ cup shredded coconut (toasted) for a tropical twist—it caramelizes beautifully.
If you love crunch, mix in ½ cup chopped candied ginger for a festive holiday touch. Toast the pecans separately for extra depth of flavor.
Protein Boosters
Stir ½ cup black beans (rinsed) into the filling for fiber and protein without altering texture. Fold in ½ cup cooked quinoa (cooled) for a nutty, hearty element.
For a savory option, sprinkle ½ cup crumbled bacon or chopped chorizo over the streusel before baking—smoky flavors balance the sweetness perfectly. 🥓
Nutrition facts
Frequently asked questions
Can I make this sweet potato casserole ahead of time?
Prepare the filling and topping separately up to 3 days ahead and store them in airtight containers in the fridge. Assemble the casserole just before baking—this ensures the streusel stays crispy. If you must bake ahead, cover it with foil and refrigerate for up to 2 days, then reheat at 350°F for 20 minutes to restore the crunch.
What if my casserole turns out too dry?
If the filling seems dry, it likely didn't have enough moisture. Next time, add 1-2 tablespoons coconut milk to the filling or reduce baking time by 5 minutes. For an immediate fix, drizzle 2 tablespoons warm coconut milk over the top before serving—it'll soak in and add creaminess without altering texture.
Can I substitute sweet potatoes with regular potatoes?
No—sweet potatoes are essential! Their natural sweetness and vibrant color create the perfect balance with the spices. Regular potatoes lack the depth of flavor and will make the dish taste bland. If you're in a pinch, try yams, but they're less sweet and may need extra maple syrup (1 extra tablespoon) to compensate.
Why does my streusel turn out crumbly instead of crispy?
This usually happens when the butter melts too quickly during baking. Try these fixes: Chill the streusel mixture for 30 minutes before adding it to the filling, or use more cold butter (add 1 extra tablespoon). Also, bake at 350°F instead of 375°F—lower heat helps the streusel crisp without melting.
Is this casserole kid-friendly?
Yes, but with a few tweaks! Kids often prefer milder flavors, so reduce the cloves to ¼ teaspoon and add ½ teaspoon vanilla extract for extra sweetness. You can also top it with mini marshmallows (toasted lightly) or a sprinkle of powdered sugar-free vanilla frosting for extra appeal.