📖 Instructions

1. **Prepare the Sweet Potatoes**: First things first, get those sweet potatoes ready! Peel about 3 pounds of sweet potatoes, then chop them into roughly 1-inch chunks. This helps them cook more evenly. Pop them into a large pot and cover them with cold water by about an inch. Add a pinch of salt to the water—it really helps season the potatoes from the inside out. Bring the water to a rolling boil over high heat, then reduce the heat to medium-low, cover, and let them simmer for about 15-20 minutes. You want them fork-tender, meaning a fork should easily slide through a piece. Don't overcook them to mush, or they'll be watery.
2. **Drain and Mash**: Once they're perfectly tender, carefully drain the sweet potatoes using a colander. Let them sit in the colander for a couple of minutes to steam dry a bit. This step is crucial for avoiding a watery casserole! Transfer the drained sweet potatoes to a large mixing bowl. Now, mash 'em up! You can use a potato masher for a slightly rustic texture, or an electric mixer on medium speed for a super smooth, creamy consistency. I usually go for the mixer; it's less work and the result is just dreamy.
3. **Mix in the Good Stuff**: To your mashed sweet potatoes, add 1/2 cup (1 stick) of unsalted butter, melted. Then, pour in 1/2 cup of whole milk (or half-and-half for extra richness), 1/2 cup of light brown sugar (packed), 2 large eggs (lightly beaten), 1 teaspoon of vanilla extract, 1/2 teaspoon of ground cinnamon, and a tiny pinch of ground nutmeg. Don't go crazy with the nutmeg; a little goes a long way. Mix everything together really well until it's all combined and super creamy. Taste a small bit – does it need more sugar? More spice? Adjust to your liking! This is your moment to shine.
4. **Prepare for Baking**: Preheat your oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish (or a 2-quart casserole dish) with butter or cooking spray. Pour the sweet potato mixture into the prepared dish and spread it out evenly with a spatula.
5. **Bake the Casserole (Initial Bake)**: Place the dish in the preheated oven and bake for 25-30 minutes. You want the sweet potato mixture to be heated through and slightly set. It might puff up a little bit, which is totally normal.
6. **Add Marshmallows**: Once the initial baking time is up, carefully remove the casserole from the oven. Arrange about 4 cups of miniature marshmallows evenly over the top of the sweet potato mixture. Make sure they cover the surface nicely, like little fluffy clouds.
7. **Toast the Marshmallows**: Return the casserole to the oven. Here's where you need to be vigilant! Bake for another 5-10 minutes, or until the marshmallows are golden brown and perfectly toasted. If your oven has a broiler, you can even switch it on for the last 2-3 minutes to get that perfect golden-brown char, but whatever you do, *do not walk away*. Marshmallows go from perfect to burnt in a blink! They'll puff up beautifully and get all gooey.
8. **Cool and Serve**: Once the marshmallows are perfectly toasted, carefully remove the casserole from the oven. Let it cool for about 10-15 minutes before serving. This allows the casserole to set a bit and makes it easier to serve. Plus, those marshmallows are molten hot! Serve warm and watch it disappear. Enjoy your perfectly crafted comfort!