Foryoueats: Texas Sheet Cake Cookies

1/2 c. semisweet chocolate chips

1 1/2 c. all-purpose flour

1/4 c. unsweetened cocoa powder

1 tsp. baking powder

1/4 tsp. baking soda

1/4 tsp. kosher salt

1 stick salted butter, at room temperature

1/3 c. granulated sugar

1/3 c. packed light brown sugar

1 large egg, at room temperature

1 tsp. vanilla extract

1/3 c. buttermilk

3/4 c. chopped toasted pecans

6 tbsp. salted butter

1/4 c. milk

2 tbsp. unsweetened cocoa powder

1 tsp. vanilla extract

2 c. powdered sugar, sifted

Texas Sheet Cake Cookies