📖 Instructions

1. Prep the Sweet Potatoes: Begin by peeling your sweet potatoes with a vegetable peeler. Once peeled, cut them into roughly 1-inch cubes. This ensures they cook evenly and quickly.
2. Boil the Potatoes: Place the cubed sweet potatoes in a large saucepan. Cover them with cold water by about an inch. Add a pinch of salt to the water – this helps season the potatoes from the inside out. Bring the water to a boil over medium-high heat. Once boiling, reduce the heat to medium-low and simmer for about 15-20 minutes, or until the sweet potatoes are fork-tender and easily pierced. They should be soft enough to mash without resistance.
3. Drain Thoroughly: Carefully drain the cooked sweet potatoes using a colander. Allow them to sit in the colander for a few minutes to steam dry. This step is crucial for preventing a watery casserole; you want as much excess moisture as possible to evaporate.
4. Mash the Potatoes: Transfer the drained sweet potatoes to a large mixing bowl. Using a potato masher, mash them until very smooth. For an extra creamy texture, you can use an electric hand mixer on low speed, but be careful not to overmix, which can make them gummy.
5. Add the Goodies (Base Mixture): To the mashed sweet potatoes, add the softened unsalted butter (make sure it's room temperature for easy blending), milk or heavy cream, light brown sugar, vanilla extract, ground cinnamon, and ground nutmeg. Mix everything together really well with a rubber spatula or the electric mixer until all ingredients are fully incorporated and the mixture is smooth and evenly spiced. Taste it! This is your chance to adjust the sweetness or spice levels to your preference. Maybe you like a little more cinnamon? Go for it!
6. Preheat Oven & Prepare Dish: Preheat your oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish with butter or cooking spray. This prevents sticking and makes cleanup a breeze.
7. Assemble the Casserole: Spoon the sweet potato mixture into the prepared baking dish. Spread it evenly using your spatula. You want a nice, flat surface for the marshmallows.
8. Initial Bake (No Marshmallows): Place the baking dish in the preheated oven and bake for 20 minutes. This allows the sweet potato base to heat through and slightly firm up before the marshmallows are added.
9. Add Marshmallow Topping: Carefully remove the casserole from the oven. Evenly distribute the miniature marshmallows over the top of the hot sweet potato mixture. Don't be shy; cover it generously!
10. Final Bake & Toast: Return the casserole to the oven and bake for an additional 5-10 minutes, or until the marshmallows are puffed, golden brown, and delightfully toasty. Keep a very close eye on them during this stage, as marshmallows can burn quickly. If they start browning too fast, you can cover them loosely with foil. Some folks even use the broiler for a minute or two at the very end to get that perfect char, but watch it like a hawk!
11. Cool and Serve: Once toasted to perfection, remove the casserole from the oven. Let it cool for about 10-15 minutes before serving. This cooling time allows the casserole to set slightly and the marshmallows to become wonderfully gooey but not molten hot. Serve warm and watch it disappear!