Grandma’s Sweet Potato Casserole

Instructions:

1. Preheat your oven to 350°F (175°C) and prepare a 9×13-inch baking dish by lightly greasing it with butter or cooking spray to prevent sticking.
2. Place the peeled and cubed sweet potatoes in a large pot, cover them with water, and bring to a boil. Cook for 15–20 minutes until the potatoes are fully tender and easy to pierce with a fork.
3. Drain the cooked sweet potatoes well to avoid excess moisture, then transfer them to a large bowl. Mash the potatoes thoroughly until smooth and creamy, ensuring there are no large lumps for a silky texture.
4. Mix in the melted butter, brown sugar, whole milk, vanilla extract, ground cinnamon, ground nutmeg, and salt. Stir until all ingredients are evenly combined to build the casserole’s rich and spiced flavor.
5. Let the mixture cool slightly before adding the lightly beaten eggs. This prevents the eggs from cooking prematurely and helps them incorporate smoothly for a custardy consistency.
6. Spread the sweet potato filling evenly into the prepared baking dish, smoothing the surface with a spatula for an even bake and attractive presentation.
7. Bake uncovered for 25–30 minutes until the filling is thoroughly heated and the center is set but still moist, ensuring a creamy base beneath the topping.
8. Remove the dish from the oven and cover the surface with a generous, even layer of mini marshmallows. The marshmallows will create a sweet, golden crust that contrasts the creamy sweet potatoes.
9. Return the casserole to the oven and bake for another 5–8 minutes until the marshmallows puff up and turn a light golden brown, creating the classic gooey topping.
10. For a deeper toasted finish, switch your oven to broil and carefully broil the marshmallows for 30–60 seconds. Watch closely to prevent burning, as marshmallows can quickly darken and become bitter.
11. Allow the casserole to rest for 5–10 minutes after baking; this helps the filling firm up slightly for easier serving and lets the flavors meld perfectly.

Variations

• Substitute maple syrup or honey for brown sugar to add a different natural sweetness and subtle flavor depth to the filling.
• Add a crunchy pecan topping beneath the marshmallows for texture contrast and a nutty complement to the sweet potatoes.
• Incorporate a pinch of cayenne pepper or ground ginger into the filling for a mild spicy kick that balances the sweetness.
• Use coconut milk instead of whole milk for a dairy-free version with a slight tropical flavor.
• Swap mini marshmallows for chopped toasted marshmallows or marshmallow fluff spread for a softer, less browned topping.
• Mix in shredded sharp cheddar cheese with the sweet potato mixture for a savory twist that pairs well with the sweet topping.

Tips

• Use freshly cooked sweet potatoes rather than canned for a naturally sweet, creamy texture and better flavor.
• Cool the sweet potato mixture slightly before adding eggs to prevent curdling and ensure a smooth custard-like filling.
• Store leftovers in an airtight container in the refrigerator for up to 3–4 days to maintain freshness.
• Reheat individual servings gently in the microwave or rewarm the entire casserole in a 325°F (160°C) oven until heated through, to preserve texture and flavor.
• Add marshmallows only in the last few minutes of baking to achieve a golden, puffed topping without melting them completely into the filling.
• Watch carefully when broiling marshmallows; they can burn quickly, so keep the oven door slightly open and check every 15 seconds.
• For easy serving, let the casserole rest after baking so it firms up enough to slice cleanly without sticking to the spatula.