INGREDIENTS
1/2 cup
unsalted butter, at room temperature
1/2 cup
sugar
1/2 cup
loosely packed brown sugar
1
large egg
2 tsp
vanilla extract
1 1/4 cups
all-purpose flour
1/2 tsp
baking soda
1/4 tsp
salt
3/4 cup
rolled oats
optional: 1-2 tablespoons milk, if dough is super crumbly
2/3 cup
dark chocolate chips
2/3 cup
white chocolate chips
marshmallow buttercream filling
1/2 cup
unsalted butter, softened
1 cup
marshmallow cream (homemade or store-bought is fine)
1/2 cup
powdered sugar
1 tsp
vanilla extract
1 pinch
salt