INGREDIENTS
2 1/4 cups
flour
2 1/2 tbsp
cocoa powder
1 1/2 tsp
cornstarch
3/4 tsp
baking soda
1/2 tsp
salt
8 tbsp
butter, at room temperature
5 tbsp
shortening
1 1/2 cups
sugar
1
egg
1
egg yolk
1 1/2 tbsp
white vinegar
1 1/2 tsp
vanilla
1 tbsp
red food coloring
3/4 cup
white chocolate chip cookies plus more for garnishing