1. In a large mixing bowl, cream the butter and sugars together until thoroughly combined and the mixture becomes light and fluffy. Add the eggs, one at a time, and mix until completely incorporated.
2. Add the vanilla. Add the flour, baking powder, baking soda and salt. Mix until thoroughly combined.
3. Stir in 1 ¹/₂ C. baking chips.

To make the surprise balls

1. Preheat the oven to 375° F.
2. Lightly grease a ball pan. Portion dough into 1 ¹/₂-inch balls and place a dough ball in each cavity. Firmly press the dough into the cavity and up sides to evenly distribute the dough.
3. Bake for 17-19 minutes or until the top edge of cookies are dark brown and firm.
4. Remove from the oven and use a paring knife to cut off any excess dough.
5. Cool in pan on cooling rack for 10 minutes, then cool completely on cooling rack.

To assemble: Prepare Buttercream Frosting

1. Put candy of your choice on the inside of bottom half.
2. Put frosting into a piping bag and cover the rim of the bottom half. Gently place the top half to form the ball, then pipe the frosting to hide the seam.
3. Decorate the ball with sprinkles, extra chocolate chips and a drizzle of melted chocolate chips.