
This lightened-up sweet potato casserole transforms a traditionally sugar-heavy holiday dish into a wholesome delight that doesn't sacrifice flavor. The creamy sweet potato base pairs perfectly with the crunchy oat-pecan topping for a side dish that balances nutrition and indulgence.
I first created this recipe when trying to please both my health-conscious sister and tradition-loving father at Thanksgiving. The empty dish and requests for the recipe confirmed I had struck the perfect balance.
Ingredients
- Sweet potatoes: Provide natural sweetness and are packed with vitamins A and C. Choose firm potatoes with vibrant orange flesh for best flavor
- Greek yogurt: Adds creaminess and protein while cutting back on fat. Full fat works best for richness
- Maple syrup: Offers complex flavor beyond just sweetness. Use pure maple syrup not pancake syrup
- Vanilla extract: Enhances natural sweetness. Pure extract makes a noticeable difference
- Cinnamon and nutmeg: Provide warmth without added calories. Freshly grated nutmeg elevates the flavor
- Rolled oats: Create texture in the topping while adding heart healthy fiber
- Pecans: Contribute healthy fats and essential crunch. Toast them lightly before adding for enhanced flavor
- Almond flour: Binds the topping without wheat flour making this naturally gluten free
Step-by-Step Instructions
- Prepare Sweet Potatoes:
- Cut potatoes into even 1-inch cubes for faster more consistent cooking. Boil until a fork easily pierces through with no resistance typically 12 to 15 minutes. Drain thoroughly as excess water will make the casserole watery.
- Create The Creamy Base:
- Mash potatoes while still warm for the smoothest texture. Use a potato masher for a rustic finish or an electric mixer for ultra-creamy results. Add Greek yogurt first to help with creaminess then incorporate remaining ingredients gradually.
- Develop Flavor Profile:
- Stir in maple syrup, vanilla extract, and spices ensuring they are evenly distributed. Taste and adjust seasonings keeping in mind flavors will deepen during baking. The mixture should be creamy but hold its shape not runny.
- Craft The Streusel Topping:
- Combine dry ingredients first then drizzle in the wet ingredients. Use your fingertips to create little clusters with varying sizes for textural interest. The mixture should feel slightly moist but crumbly.
- Layer And Bake Strategically:
- Spread the sweet potato mixture in an even layer pressing down lightly to remove air pockets. Sprinkle the topping evenly ensuring complete coverage. Bake until the topping turns golden brown and you can see slight bubbling around the edges.

The Greek yogurt addition was actually a happy accident when I ran out of cream one Thanksgiving. My grandmother declared it better than her original recipe which remains my proudest cooking moment to date.
Make-Ahead Magic
This casserole benefits from a rest period allowing flavors to meld beautifully. Prepare the entire dish up to two days in advance store covered in the refrigerator and bake just before serving. If baking from cold add an extra 10 minutes to the cooking time. You can also freeze the unbaked casserole for up to one month just thaw overnight in the refrigerator before baking.
Perfect Substitutions
This recipe welcomes adaptations based on dietary needs or what you have on hand. Coconut yogurt works beautifully for a dairy free version. Honey can replace maple syrup though it has a stronger flavor profile. For nut allergies sunflower seeds and pumpkin seeds make excellent alternatives to pecans providing similar texture and nutritional benefits. Sweet potato varieties can also be mixed orange sweet potatoes provide classic flavor while purple varieties add visual interest and additional antioxidants.

Serving Suggestions
While traditionally a Thanksgiving side this casserole pairs wonderfully with roasted chicken or pork tenderloin for everyday meals. For breakfast repurpose leftovers topped with a dollop of yogurt and fresh fruit. The casserole also transforms into a delightful dessert when served warm with a small scoop of vanilla ice cream. For a complete meal pair with bitter greens like arugula or kale salad dressed with a bright vinaigrette to balance the sweetness.
Holiday Table Strategy
Position this casserole between heavier and lighter offerings on a buffet table. The versatile flavor profile complements both savory dishes like turkey and ham while transitioning nicely to cranberry sauce and other sweet accompaniments. For potlucks transport the base and topping separately then assemble and bake at your destination for maximum freshness. This recipe doubles easily for larger gatherings just use a larger baking dish and increase cooking time by about 10 minutes.
Common Questions
- → How can I make this sweet potato casserole ahead of time?
You can prepare the sweet potato base up to 2 days ahead and store it covered in the refrigerator. Make the streusel topping separately and store in an airtight container. When ready to serve, bring the sweet potato mixture to room temperature, add the topping, and bake as directed, adding a few extra minutes if needed.
- → Can I freeze this lightened-up casserole?
Yes! Prepare the casserole but don't bake it. Cover tightly and freeze for up to 3 months. Thaw overnight in the refrigerator, then bake as directed, adding 10-15 minutes to the cooking time. For best texture, add the streusel topping fresh before baking.
- → How do I make this sweet potato dish completely dairy-free?
Replace the Greek yogurt with coconut yogurt or your favorite unsweetened dairy-free yogurt. Substitute the butter with coconut oil or a plant-based butter alternative in both the sweet potato mixture and the streusel topping. The flavor profile will be slightly different but equally delicious.
- → Can I use canned sweet potatoes instead of fresh?
Yes, though fresh is preferred for texture and flavor. If using canned, drain and rinse them well to remove excess syrup. You'll need about 4 cups of drained canned sweet potatoes. Skip the boiling step and adjust sweetener to taste as canned varieties often contain added sugars.
- → What makes this version healthier than traditional sweet potato casserole?
This lightened version uses Greek yogurt instead of heavy cream, significantly less sweetener (relying on maple syrup instead of refined sugar), and a moderate amount of heart-healthy fats from nuts and minimal butter. The oat-pecan topping replaces the traditional sugary marshmallow or brown sugar-butter crumble, reducing overall calories and increasing nutritional value.
- → Can I add marshmallows to this healthier version?
Yes! For a hybrid version that satisfies traditionalists while maintaining a healthier profile, sprinkle a thin layer of mini marshmallows on top during the last 5 minutes of baking. They'll get golden and toasty without adding too many extra calories or overwhelming the dish.