What you need:
1/2 cup butter, at room temperature
1 cup sugar
1 teaspoon white vinegar
1 large egg
1 teaspoon vanilla extract
1 1/2 teaspoons red food coloring
1 1/2 cups all purpose flour
2 1/2 tablespoons cocoa
1 teaspoon corn starch
3/4 teaspoon baking powder
1/8 teaspoon salt
3/4 cup white chocolate chips plus extra for garnish
Preheat oven to 375 degrees.
Mix butter and sugar in a bowl with an electric mixer until fluffy, about 2-3 minutes. Add vinegar, mix until combined. Add egg, mix until combined. Scrape down sides of the bowl. Add vanilla and red food coloring, mix until combined.
To the butter mixture, add flour, cocoa, corn starch, baking powder and salt. Mix on low until combined. Stir in the white chocolate chips.
Line the cookie sheets with parchment paper. Roll dough into ping pong sized balls and place on cookie sheet about 2 inches apart. Bake for 9-11 minutes. When you take the cookies out of the oven, gently press a few white chocolate chips tip side down, into the top of the cookies for garnish.