Using a free-standing mixer or hand-held mixer, beat the butter and cream cheese for a few minutes until light and fluffy.
Add the sugar, egg yolk vanilla and red food gel. Beat again until well combined.
Sift in the flour, cocoa powder, along with a pinch of salt. Fold through until dough starts to come together. Tip out onto a clean and floured surface and lightly knead into a ball. Flatten slightly and wrap with cling film and chill in the fridge for 1 hour.
Preheat oven to 180 degrees and line a baking tray with greaseproof paper and set aside.
Remove chilled and rested dough from the fridge. On a clean and floured surface, roll out dough with floured rolling pin until 5mm thick. Use a cookie cutter to cut into desired shapes, place on baking tray and bake for 14-15 minutes or until cooked through, but still soft to the touch. Allow to cool.
For the icing, beat the cream cheese in the free-standing mixer or hand-held mixer again.
Slowly add sifted icing sugar while still mixing on a low speed.
Add vanilla and milk and beat on a higher speed until smooth. Note: Add more or less milk, depending on consistency you like.
Pipe or spread icing over top of cooled biscuits and enjoy.
Recipe by Baker Gatherer at https://bakergatherer.com/red-velvet-cookie/