Step 1

Preheat oven to 400 degrees F (200 degrees C). Line a baking sheet with parchment paper.

Step 2

Rub olive oil onto the outside of each sweet potato and sprinkle sea salt over each. Arrange sweet potatoes on the prepared baking sheet.

Step 3

Bake in the preheated oven until a sharp knife easily pierces the potato, 50 to 60 minutes. Cool sweet potatoes until easily handled, 10 to 15 minutes.

Step 4

Melt butter in a saucepan over medium heat until solids begin to brown and smell nutty, 5 to 8 minutes.

Step 5

Slice potatoes in half lengthwise and scoop insides into a large bowl. Add browned butter, cream cheese, 1/2 teaspoon salt, cayenne pepper, and black pepper and mash using a potato masher until smooth. Spoon mixture back into the sweet potato skins and top each with 1/4 cup marshmallows. Place sweet potatoes back onto the baking sheet.

Step 6

Bake in the oven until warmed through and marshmallows are toasted, about 10 minutes.