Blend the cottage cheese in a small blender or food processor until completely smooth.
In a large bowl, beat the butter and sweetener until creamy. Add the blended cottage cheese, egg yolk, vanilla, and red food coloring, and beat until smooth and evenly red.
Whisk together the almond flour, cocoa powder, baking powder, xanthan gum, and salt. Stir into the wet mixture until a soft dough forms, then fold in the white chocolate chips. Chill for 30 minutes.
Preheat the oven to 350°F and line a baking sheet with parchment paper. Scoop the dough into 1 1/2 tbsp balls and flatten each one to about 1/2 inch thick.
Bake for 11 to 13 minutes, until the tops look set. Cool on the baking sheet for 15 minutes, then move to a wire rack and cool completely.
Whisk the cream cheese, powdered sweetener, heavy cream, and vanilla until smooth. Drizzle over the cooled cookies and let set for 15 minutes.