INGREDIENTS
1/2 cup
or 115g) unsalted butter, softened to room temperature
3/4 cup
packed dark brown sugar
2
large eggs
2/3 cup
creamy peanut butter
1 tsp
vanilla extract
1
and 1/4 cups (160g) all-purpose flour (careful not to overmeasure)
1 tsp
baking powder
1/4 tsp
salt
1/4 cup
buttermilk*
7 1/2 oz
(1 cup; 213g) container marshmallow creme (Fluff)
8 oz
cream cheese, softened to room temperature*
1/2 cup
confectioners' sugar
2 tsp
vanilla extract
1/2 tsp
salt
8
Reese's Peanut Butter Cups, chopped (optional)