Preheat your oven to 350°F (175°C). In a mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy. Add the egg and vanilla extract, then mix until smooth. Add blue food coloring a little at a time until you reach your desired shade.

In a separate bowl, whisk together the flour, baking soda, and salt. Gradually mix the dry ingredients into the wet mixture until a soft dough forms.

Fold in the semi-sweet chocolate chips, white chocolate chips, and chopped cookies. If using, gently press a mini cookie into the top of each dough ball before baking for added flair.

Scoop the dough into balls and place them on a parchment-lined baking sheet, spacing them a couple of inches apart. Bake for 9–11 minutes, until the edges are just set but the centers look slightly underbaked. Let cool on the sheet for 5 minutes before transferring to a wire rack.