Why roast the sweet potatoes instead of boiling them for this healthy sweet potato casserole?

Roasting at 425 degrees caramelizes the natural sugars through dry heat, creating deep toasty flavor that boiling washes away. Boiled potatoes absorb water, which thins the mash and dilutes every other ingredient. Cubed and roasted, they also cook in about 30 minutes with almost no hands on time.

Can I make healthy sweet potato casserole without eggs?

Yes, replace each egg with a quarter cup of unsweetened applesauce or a flax egg (1 tablespoon ground flaxseed mixed with 3 tablespoons water, rested 5 minutes). The casserole will be slightly softer but still sliceable after the 10 minute rest. The Greek yogurt already provides plenty of binding, so the eggs are not doing all the structural work.

What can I use instead of marshmallows on top of sweet potato casserole?

The oat pecan streusel in this recipe is the intended replacement, delivering crunch and buttery flavor without the sugar spike. For a nut free option, use extra oats with pumpkin seeds. If you still want marshmallows, add a thin layer only during the last 5 minutes of baking so they toast without turning the whole dish gummy.

How do I keep the streusel topping crispy when reheating leftovers?

Reheat portions uncovered in a 375 degree oven for about 10 minutes, which re-crisps the oats and pecans as the filling warms through. For the microwave, heat covered first, then finish under the broiler for 60 seconds, watching closely. Never reheat covered in the oven, trapped steam is what makes the topping soggy.

Is sweet potato casserole actually healthy?

Yes, especially this version. This healthy sweet potato casserole swaps the classic butter and cream for Greek yogurt and roasted potatoes, so each serving lands around 210 calories with real fiber and vitamin A. It is still a holiday side, not a diet food, but one you can enjoy without the usual sugar crash.

Healthy Sweet Potato Casserole: Light Thanksgiving Side

Ingredients

Scale

3 lbs sweet potatoes, peeled and cut into 1-inch cubes
2 tbsp olive oil
1 tsp kosher salt, divided
1/2 cup plain Greek yogurt (2% or whole milk)
3 tbsp pure maple syrup
1 tbsp fresh orange juice
1 tsp orange zest
1 tsp freshly grated ginger
1/2 tsp ground cinnamon
1/4 tsp ground nutmeg
1/4 tsp black pepper
3/4 cup old-fashioned rolled oats
1/2 cup chopped pecans
3 tbsp coconut sugar (or brown sugar)
3 tbsp melted coconut oil (or butter)
1/2 tsp ground cinnamon (for streusel)
1/4 tsp kosher salt (for streusel)

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Instructions

Preheat the oven to 425°F (220°C). Toss the sweet potato cubes with the olive oil and 1/2 teaspoon of the salt on a large rimmed baking sheet, spreading them in a single layer.
Roast for 25 to 30 minutes, flipping once halfway, until the cubes are deeply caramelized at the edges and completely tender when pierced with a fork.
Reduce the oven temperature to 375°F (190°C). Transfer the hot roasted cubes to a large bowl.
Add the Greek yogurt, maple syrup, orange juice, orange zest, grated ginger, cinnamon, nutmeg, black pepper, and the remaining 1/2 teaspoon of salt.
Mash with a potato masher until mostly smooth with a few rustic chunks remaining. Taste and adjust sweetness or salt if needed.
In a separate bowl, stir together the oats, chopped pecans, coconut sugar, melted coconut oil, cinnamon, and salt until every crumb is coated and clumpy.
Spread the mashed sweet potatoes evenly in a greased 9×13 inch (or 2-quart) baking dish. Sprinkle the streusel evenly over the top, edge to edge.
Bake for 20 to 25 minutes, until the streusel is golden and crisp and the edges bubble gently.
Rest for 10 minutes before serving so the casserole sets. Serve warm. Leftovers keep 4 days refrigerated.

Author: Nora Ellis
Prep Time: 20 minutes
Cook Time: 50 minutes