Add the butter and shortening to a large bowl.

Mix until smooth and creamy.

Add the vanilla extract and 1 cup of powdered sugar.

Mix on low speed, then gradually increase to medium speed until the mixture is completely combined.

Add the remaining powdered sugar, milk, and food coloring.

Mix on low speed, then gradually increase to high.

Beat for 2 to 3 minutes until light and fluffy. If the frosting is not smooth, add 1 tablespoon of milk and beat on medium-high speed for 4 to 5 minutes, or until the frosting is fluffy.

You can use tip #233 or #16 for decorating your cupcakes.

Attach a coupler and tip 233 to your piping bag. You can practice on a paper towel to get accustomed to the pressure and movement of the tip.

Apply quick spurts of pressure to mimic small patches of fur. Pulling up as you release will create longer fur. For a messier look or if in a hurry, squeeze in a continuous pattern all over the cupcake.

Finish the frosted Cookie Monster cupcakes with candy eyes and half a chocolate chip cookie for Cookie Monster's eyes and mouth.

Fit a piping bag with a coupler, then add a single star tip (#16).

Fill half of the bag with frosting and twist off the top.

Hold the bag at a 90-degree angle and pipe stars all over each cupcake.

To achieve the best results, follow a pattern of squeezing, stopping, and releasing. This helps avoid tails of frosting.

Keep the stars close together to create a fur-like effect. Make sure to fill all the gaps.

Finish the frosted Cookie Monster cupcakes with candy eyes and half a chocolate chip cookie for the eyes and mouth.