INGREDIENTS
3
large eggs, room temperature
1 1/2 cups
buttermilk, room temperature
1 1/2 cups
brewed espresso, hot
3/4 cup
canola oil (or vegetable)
1 1/2 tsp
vanilla extract
3 cups
flour (all purpose)
1/2 cup
cocoa powder
1 tbsp
baking soda
1 1/2 tsp
baking powder
1 tsp
salt
8
large egg whites, room temperature
2 cups
granulated sugar
2
lbs butter, cut into 1" chunks
2 tsp
vanilla extract
15
Oreo cookies, pulsed in your food processor to crumbs (optional, see notes), plus more for on top