1
Line two baking trays with baking paper.
2
Combine the butter, cream cheese, both sugars, baking soda, salt, and vanilla extract in a large bowl.
3
Mix until creamy, uniform in color, and clinging to the side of the bowl.
4
Scrape down the sides of the bowl, add the egg and mix in.
6
Add the egg yolk, red food coloring, flour, and cocoa powder. Mix gently until the dry ingredients are just absorbed.
7
Add the white chocolate chips, reserving a handful for topping, and mix until evenly distributed.
8
Wet your hands, then pat dry with a paper towel. Roll 1-inch balls of dough and place them on the prepared trays.
9
Bake one tray for 11 to 13 minutes, or until the edges are dry and set.
10
Remove from the oven and press several white chocolate chips into the tops of the warm, puffy cookies.
11
Cool on the tray for 5 minutes, then transfer to a wire rack.
12
Repeat with the other tray.