Step 1

Dough: In a large mixing bowl, mix together the cake mix, oil and eggs thoroughly. Mix in the food coloring if you'd like.

Step 2

Cover and chill in the fridge for 30 minutes. This is an optional step, but it helps to keep the cookies from spreading too much and is recommended.

Step 3

Prep: About 20 minutes into the dough chilling, start preheating the oven to 350℉. Line two baking sheets with parchment paper or silicone mats and set them aside.

Step 4

Bake: Use a small cookie scoop or a spoon to drop 1 tablespoon sized balls onto the baking sheets. Space them a few inches apart to leave room for the cookies to spread.

Step 5

Bake for 8-9 minutes. Allow the cookies to cool in the pan for about 5 minutes before transferring to a wire cooling rack to cool completely.

Step 6

Filling: While the cookies bake, you can prepare the frosting. In a medium mixing bowl using a hand mixer, beat the butter and cream cheese until smooth and creamy. Add the vanilla and lemon zest and mix until well combined. Add in the yellow food color.

Step 7

Add the powdered sugar a little at a time and mix again until all the sugar has been added and the frosting is smooth.

Step 8

Assemble: Once the cookies have cooled, you can use a piping bag or an icing spatula and put the icing on the bottom of a cookie. Then grab another cookie to place on top and you have a cookie sandwich! Repeat with the rest of the cookies. Serve and enjoy!