Double Chocolate Chip Mint Cookies

1 stick unsalted butter, softened
1/2 cup brown sugar
1/2 cup sugar
1 egg
2 tsp. vanilla extract
1/2 tsp. mint extract, optional
1 cup plus 2 Tbsp. flour
1/3 cup cocoa powder
1/2 tsp. baking soda
1 tsp. cornstarch
1/2 tsp. salt
1/2 cup semi-sweet chocolate chips
1/2 cup mint baking bits

Preheat oven to 350º. 

Mix butter until light and fluffy, about 1 minute. Add in sugars and mix until well combined. Add in egg and extract. Mix until combined.

In a separate bowl, sift together flour, cocoa powder, baking soda, cornstarch, and salt. Slowly incorporate dry ingredients into wet ingredients. Mix until just combined.

Add in chocolate chips and mint baking bits. Mix slowly. Once combined, chill dough in the refrigerator for about 20 minutes. 

Scoop dough into dollops and place 2-inches apart on a baking sheet lined with parchment paper. Bake for 13 to 15 minutes, or until cookies are done.