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Export 10 ingredients for grocery delivery
Step 1
In KitchenAid mixer, cream together butter and sugars on medium speed until light and fluffy.
Step 2
Add eggs, one at a time, and then vanilla, stirring until combined.
Step 3
In separate bowl combine flour, graham cracker crumbs, cornstarch, baking powder, baking soda, and salt.
Step 4
Gradually add flour mixture to butter mixture, pausing periodically to scrape down the sides of the bowl with a spatula.
Step 5
Stir in mini marshmallows, chocolate chips, and milk chocolate pieces.
Step 6
Preheat oven to 375F (190C) and line cookie sheets with parchment paper.
Step 7
Portion cookies into 1 ½" balls. If desired, press additional pieces of chocolate bar or marshmallows on top of dough.
Step 8
Bake on 375F (190C) for 10 minutes.
Step 9
Allow cookies to cool on cookie tray for 5 minutes before transferring to wire rack to cool completely.