Brownie Crinkle Cookies with Chocolate Chips

Brownie Crinkle Cookies with Chocolate Chips
Ingredients:
1 cup semi-sweet chocolate chips 
2 tbsp unsalted butter 
¾ cup granulated sugar 
2 large eggs 
1 tsp vanilla extract 
½ cup all-purpose flour 
2 tbsp unsweetened cocoa powder 
½ tsp baking powder 
¼ tsp salt 
½ cup extra chocolate chips (for folding in) 
Instructions:
Melt chocolate and butter: In a microwave-safe bowl, melt 1 cup of chocolate chips and butter in 20-second increments, stirring after each until smooth and melted. Set aside to cool slightly.