01 -
Set the oven to 375°F.
02 -
Place cubed sweet potatoes in a large pot and cover with cold water. Generously season the water with salt and bring to a boil. Reduce heat and simmer for 10 minutes until potatoes are fork tender.
03 -
Drain sweet potatoes and return to pot. Mash until smooth with no large lumps remaining. Stir in whole milk, salted butter, brown sugar, kosher salt, ground cinnamon, nutmeg, clove, maple syrup, and vanilla extract until fully combined.
04 -
Transfer the seasoned sweet potato mixture to a large oven-safe baking dish and smooth the surface evenly.
05 -
Evenly spread mini marshmallows over the sweet potato layer.
06 -
Bake in the preheated oven for 20 to 25 minutes until marshmallows are golden brown and the casserole is bubbling.
07 -
Remove from oven and let rest for 5 minutes before serving.