chocolate mint sugar cookie bars

Ingredients For chocolate mint sugar cookie bars

• 1/2 c

  butter, softened
• 1/2 c

  brown sugar
• 1/2 c

  sugar
• 1

  egg
• 2 tsp

  vanilla
• 2 c

  flour
• 1/2 c

  dark cocoa powder
• 1 tsp

  baking powder
• 1/2 tsp

  salt
• FOR THE MINT FROSTING
• 1/2 c

  butter, softened
• 1/2 tsp

  mint extract
• 6 Tbsp

  whipping cream
• 1/4 tsp

  salt
• 4 c

  powdered sugar
• green gel food coloring
• 1 c

  andes mint chips