Cookies and Cream Cake

INGREDIENTS

12 oz

all-purpose flour ((2 2/3 cup))

2 1/4 oz

black cocoa ((3/4 cup), can substitute regular dutch-processed cocoa if desired)

2 1/4 oz

dutch-processed cocoa ((3/4 cup))

1 3/4 tsp

baking powder

3/4 tsp

baking soda

1 1/2 tsp

salt

24 1/2 oz

granulated sugar ((3 1/2 cups))

1 1/4 cups

coffee (at room temperature (can substitute water))

1 1/4 cups

buttermilk (at room temperature)

3/4 cup

vegetable oil

eggs (at room temperature)

egg yolks (at room temperature)

1 tbsp

vanilla extract

6 fluid_ounces

pasteurized liquid egg whites ((3/4 cup, see Note below))

24 oz

powdered sugar ((6 cups))

1/2 tsp

salt

24 oz

unsalted butter (at room temperature (6 sticks))

2 tbsp

vanilla extract

Oreo cookies ((8 oz cookies))

4 oz

dark chocolate (finely chopped)

6 fluid_ounces

heavy cream

Mini Oreo cookies for decorating