Preheat the oven to 350 degrees and line a baking sheet with parchment paper.

In a medium sized mixing bowl, cream the butter, brown sugar, and sugar together.

Add the egg and vanilla and mix well.

Stir in the flour, cornstarch, baking powder, and salt.

Use a two tablespoon cookie scoop to create cookie dough balls.

Place the cookie dough balls on the prepared baking sheet about 2” apart.

Bake for 9 minutes.

Remove from the oven and shape the edges with a large cup or cookie cutter.

Let the cookies cool completely on the baking sheet.

While the cookies cool, make the frosting.

To make the frosting, beat the butter until smooth and creamy.

Add the vanilla and powdered sugar. Mix well until smooth.

Pipe the frosting onto each cookie using a zippered bag with the corner cut off.

Use a knife to spread the frosting into the center of the cookie.

Garnish the cookie with cookie dough bites and mini chocolate chips.