Making Easy Sweet Potato Casserole is simple when you follow these straightforward steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Sweet Potatoes: Peel and dice the sweet potatoes. Boil them in a large pot until fork-tender, about 15-20 minutes.
3. Mash Sweet Potatoes: Drain the sweet potatoes and mash them in a large bowl until smooth.
4. Combine Ingredients: Add sugar, milk, melted butter, eggs, vanilla extract, salt, cinnamon, and nutmeg to the mashed sweet potatoes. Mix well until fully combined.
5. Transfer to Baking Dish: Pour the sweet potato mixture into a greased 9×13-inch baking dish, spreading it evenly.
6. Prepare Topping: In a separate bowl, combine chopped pecans and mini marshmallows (if using). Sprinkle this mixture evenly over the sweet potato layer.
7. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes or until the topping is golden brown and the casserole is heated through.
8. Cool Slightly: Remove from the oven and let it cool for 5-10 minutes before serving.

These steps will guide you in creating this incredible casserole with ease!