01 -
Preheat oven to 350°F. Line a baking sheet with parchment paper and set aside.
02 -
In a mixing bowl, cream together softened butter, smooth peanut butter, brown sugar, and granulated sugar until light and fluffy.
03 -
Add the egg and vanilla extract to the creamed mixture and mix until fully combined.
04 -
Gradually incorporate flour, baking powder, baking soda, cornstarch, and salt, mixing just until no dry flour remains.
05 -
Using a large cookie scooper, portion 9 equal dough balls. Roll each between your palms and gently flatten to approximately 1 inch thick discs. Freeze the discs for 15 minutes.
06 -
Bake chilled dough discs in preheated oven for 12 to 13 minutes until edges are set but centers remain soft.
07 -
Melt milk chocolate chips with vegetable oil in a microwave-safe bowl in 30-second intervals, stirring until smooth.
08 -
Generously spread melted chocolate over each warm cookie, then top with muddy buddies. Allow cookies to cool completely on the baking sheet before serving.