Preheat the oven to 375 degrees
Whisk together all purpose flour, corn starch, salt and cocoa powder and set aside.
Cream the butter, sugar and cream cheese together in a mixing bowl until smooth.
Add in the egg yolk, vanilla and red food coloring (add enough to create the color you want, gel colors will require a lot less than liquid).
Scrape down the sides of the bowl before adding in the dry ingredients.
On low speed add half of the dry ingredients until incorporated.
Then add the remaining dry ingredients and mix until fully combined.
Place half of the dough between two sheets of parchment paper and roll out the dough to the desired thickness. (You may need to add a little flour to the top and bottom to keep it from sticking if the dough feels wet.
Using a 3 inch cookie cutter, cut out your desired shapes
Bake 12-16 minutes.
Cool for 5 mins on the baking sheet before transferring to a cookie rack to cool completely 25- 30 mins.
Frost cookies with royal icing, glaze, buttercream or cream cheese frosting.