Preheat the oven to 350 degrees. Cream together butter, brown sugar, and white sugar for 2 minutes. Add eggs, vanilla, and red food coloring and mix again.
Add flour, cocoa powder, cornstarch, baking soda, and salt. Mix until combined. The dough should be soft, but not too sticky.
If you are making Crumbl sized cookies, scoop out 1/2 cup of dough and roll it into a ball. Place it onto a greased or lined baking sheet. Flatten the dough slightly with your hand. Repeat and add up to 6 dough balls on a normal cookie sheet.
Bake at 350 for 10-12 minutes.
While the cookies are cooling, make the frosting. Combine the cream cheese and butter in a bowl and mix for 2-3 minutes. Add vanilla and powdered sugar and mix for an additional 2-3 minutes. Add frosting to a piping bag.
Once cookies are completely cooled, pipe on frosting and enjoy!!