Texas Sheet Cake Cookies

Name: Texas Sheet Cake Cookies
Prep time: 40 min
Cook time: 20 min
Total time: 1 h
Cuisine: TexMex, American
Ingredients: 0.25 cup semisweet chocolate chips (such as Ghiradelli® 60% Cacao); 1.125 cups all-purpose flour; 3 tablespoons unsweetened baking cocoa (such as Ghirardelli®); 1 teaspoon baking powder; 1 teaspoon ground cinnamon; 0.25 teaspoon baking soda; 0.5 teaspoon salt; 0.5 cup unsalted butter, softened; 0.33333334326744 cup white sugar; 1 large egg, room temperature; 1.5 teaspoons vanilla extract; 0.25 cup buttermilk, at room temperature; 5 tablespoons unsalted butter; 5 tablespoons heavy cream; 1 teaspoon vanilla extract; 0.25 teaspoon salt; 2 cups powdered sugar