01 -
Preheat oven to 350°F. Line a baking sheet with parchment paper and set aside.
02 -
In a large bowl, beat softened butter, peanut butter, brown sugar, and granulated sugar until light and fluffy. Add egg and vanilla extract and mix until fully incorporated.
03 -
Whisk together flour, baking powder, baking soda, cornstarch, and salt in a separate bowl. Gradually add to wet mixture, stirring gently until no flour streaks remain.
04 -
Divide dough into nine equal portions. Roll each into a smooth ball, flatten to one-inch thick discs, place on prepared sheet, and freeze for 15 minutes to maintain shape.
05 -
Bake chilled dough discs for 12 to 13 minutes until edges are set and tops appear dry but centers remain soft. Let cookies rest on baking sheet for 10 minutes.
06 -
While baking, melt milk chocolate chips with vegetable oil in 30-second intervals, stirring until smooth and pourable.
07 -
Immediately spread melted chocolate generously over warm cookies. Top each with three Muddy Buddy bites. Allow cookies to cool completely on baking sheet until chocolate sets.
08 -
Lightly dust cooled cookies with powdered sugar to balance flavors and add a festive appearance.