Andes mint Cookies

Name: Andes mint Cookies
Cook time: 9 min
Total time: 9 min
Cuisine: American
Ingredients: Cookies:; 1 stick butter (½ cup); ¼ cup sugar AND powdered sugar; 3 tbsp brown sugar; 1 egg; ⅓ cup oil; 25 oreos (crushed); 1 cup + 1 tbsp flour; 3 tbsp cornstarch; ¼ cup cocoa powder; ½ tsp baking soda; ¼ tsp baking powder and salt; ¼ tsp cream of tartar; 2 tsp mint extract (more or less to taste); Mint Frosting:; 2 cups powdered sugar; 1 tsp milk OR heavy cream; 1 tsp mint extract (more or less to taste)