01 -
Preheat oven to 350°F (175°C). Lightly grease a standard muffin tin with nonstick spray or butter.
02 -
In a mixing bowl, cream the softened butter with brown sugar and granulated sugar until the mixture is light and fluffy.
03 -
Beat the egg and vanilla extract into the creamed mixture until thoroughly combined.
04 -
In a separate bowl, whisk together graham cracker crumbs, flour, baking powder, and salt.
05 -
Gradually add the dry ingredients to the wet mixture, stirring until a cohesive dough forms.
06 -
Press a spoonful of dough into the bottom of each muffin cup, gently flattening to cover the base.
07 -
Place a portion of chocolate pieces over the dough in each cup.
08 -
Spoon a small amount of marshmallow fluff on top of the chocolate layer in each cup.
09 -
Top each cup with additional dough, ensuring the marshmallow is covered completely.
10 -
Bake in the preheated oven for 12 to 15 minutes, or until the tops are golden brown.
11 -
Allow cookie cups to cool in the tin for several minutes before carefully unmolding.