Soft and Chewy M&M Cookies

Name: Soft and Chewy M&M Cookies
Prep time: 20 min
Cook time: 9 min
Total time: 29 min
Cuisine: American
Ingredients: 1 1/2 cups all purpose flour (see note); 1 teaspoon baking powder; 1/2 teaspoon baking soda; 1/4 teaspoon salt; 1/2 cup unsalted butter (softened but still cool ); 1/2 cup granulated sugar; 1/3 cup brown sugar, lightly packed (make sure it's fresh and soft); 1 large egg; 2 teaspoons pure vanilla extract; 1 1/2 cups M&M's or a mixture of M&M's and chocolate chips (divided )