- Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper. 
- Cream together the butter and both sugars until light and fluffy. 
- Mix in the egg and vanilla extract, then add blue food coloring until it reaches Cookie Monster blue. 
- In a separate bowl, whisk together flour, baking soda, and salt. 
- Add the dry ingredients to the wet mixture and stir until combined. 
- Fold in chocolate chips and crushed Oreos. 
- Scoop the dough into balls and place them on the baking sheet. 
- Bake for 9–11 minutes or until the edges are just golden. 
- While warm, press candy eyes and mini cookies into the tops. 
- Cool on the baking sheet for a few minutes before transferring to a wire rack.