Lofthouse cookies

Name: Lofthouse cookies
Prep time: 15 min
Cook time: 8 min
Total time: 23 min
Cuisine: American
Ingredients: 2 1/4 cups all-purpose flour ((270g)); 1/2 teaspoon baking powder; ¼ tsp baking soda; 1 tbsp cornstarch; 1/2 tsp salt; 1/2 cup unsalted butter (room temperature (113g)); 1 cup granulated sugar ((200g)); 1 egg (room temperature); 1/4 cup sour cream room temperature ((60g)); 1 1/2 tsp vanilla extract ((7.5ml)); ¼ tsp almond extract (optional); ½ cup butter room temperature ((113g)); 2 cups powdered sugar ((240g)); 1 tsp pure vanilla extract ((5ml)); 2 tbsp Milk ((30mL) plus more if needed); Food coloring optional; Sprinkles optional