PREP TIME: 30 MINS
COOK TIME: 45 MINS
Preheat the oven to 350 degrees F. Grease 2 9 x 2-inch cake pans with cooking spray, line with parchment paper rounds, and grease.
In a large mixing bowl, add the flour, cornstarch, baking soda, Kosher salt, espresso powder and whisk together. Set aside.
Combine the apple cider vinegar and buttermilk in a wet measure, set aside in the refrigerator.