01 -
Whisk together the flour, cocoa powder, cornstarch, baking soda, and salt in a medium bowl.
02 -
In a separate bowl, beat the softened butter, granulated sugar, and brown sugar until fluffy.
03 -
Mix in the egg, vanilla extract, vinegar, and red food coloring into the butter and sugar mixture until combined.
04 -
Gradually add the dry ingredient mixture to the wet ingredients in two parts, beating until fully incorporated.
05 -
Shape the dough into approximately 1 tablespoon-sized balls using a cookie scoop, spacing them 2 inches apart on a parchment-lined baking sheet. Bake at 350°F for 7-9 minutes until the cookie tops are just set.
06 -
Beat the softened butter, vegetable shortening, and cream cheese together until smooth. Gradually add salt and powdered sugar, beating until desired sweetness and consistency are reached. Add heavy cream if the frosting is too thick.
07 -
Once cookies have fully cooled, spread an even layer of frosting onto the bottom of one cookie and top with another cookie to form a sandwich. Repeat with remaining cookies.