01 - Preheat oven to 350°F. Grease a 24-cup mini muffin tin thoroughly to prevent sticking.
02 - In a large bowl, beat together the softened butter, brown sugar, and granulated sugar until the mixture is light and fluffy.
03 - Beat in the eggs one at a time, ensuring each is fully incorporated before adding the next. Stir in the vanilla extract.
04 - In a separate bowl, whisk together the flour, baking soda, and salt until well blended.
05 - Gradually add the dry ingredients to the wet mixture, mixing on low speed until just combined. Fold in the chocolate chips.
06 - Scoop approximately 1 tablespoon of dough into each muffin cup. Press the dough lightly into the bottom and slightly up the sides to form a cup shape.
07 - Bake for 10-12 minutes or until the edges are lightly golden. Remove from the oven.
08 - Immediately use the back of a teaspoon to gently press down the center of each cookie to reinforce the cup shape.
09 - Allow the cookie cups to cool in the pan for 10 minutes before transferring them to a wire rack to cool completely.
10 - Beat the softened butter until smooth. Gradually add powdered sugar and milk alternately, beating until fluffy. Mix in the vanilla extract.
11 - Divide the frosting into three separate bowls. Tint one bowl with red gel coloring, one with blue, and leave one plain.
12 - Pipe or spoon the colored frostings into the cooled cookie cups. Top with red, white, and blue sprinkles before serving.