01 -
Mix butter and corn syrup first. Stir in vanilla, powdered sugar, a pinch of salt, and milk. Divide into two. Stir yellow coloring into one half.
02 -
Put parchment in a 9-inch dish. Add a layer of melted chocolate, spread white filling, then the yellow one, and finish with the rest of the chocolate.
03 -
Chill it for half an hour in the fridge. Use a warm knife to cut into squares once firm.