In a large mixing bowl, use an electric hand mixer to combine your salted butter and granulated sugar. Mix the ingredients on a medium speed until combined and creamy.
Add the eggs, milk, and vanilla to the mixing bowl. Use the hand mixer to whisk in the wet ingredients until the mixture is runny and a little clumpy.
Whisk the dry ingredients - the flour, cocoa powder, and baking powder - and slowly add them to the batter until just incorporated.
Gently fold in the cookie pieces, ensuring they are evenly distributed throughout the batter. Preheat your oven to 350 F.
Divide the batter evenly among a muffin tin lined with cupcake liners.
Bake the cupcakes for 20 minutes. Once they finish baking, allow them to cool while you prepare your frosting.
Make the Frosting
Add the cream cheese and powdered sugar to a bowl. Mix until smooth.
Add the food coloring and whisk again until combined.
Decorate the Cupcakes
Frost the cupcakes using a piping bag and star tip. Add two candy eyes on each cupcake to finish.
Notes
The icing was applied with a piping bag and a star tip.Be generous with your food coloring. The more you use, the deeper shade of blue you will end up with. I like to start with 6-8 drops and add more as needed. There is also navy blue food coloring if you want to go more in that direction.The cupcakes may seem a little underdone when you take them out of the oven, but they will finish baking as they cool. This helps keep moisture from baking off the cupcakes and keeps them soft and spongy inside.