For the Chocolate Cake
Preheat oven to 350ºF. Grease and line 2 8-inch round cake pans, dust with cocoa powder and set aside.
In a large bowl, add the dry ingredients; all purpose flour, sifted cocoa powder, baking powder, baking soda and salt. Whisk to combine and set aside.
In the bowl of a stand mixer fitted with the paddle attachment, combine the softened butter, oil, sugar and brown sugar. Whisk on medium speed until creamy.
Add the vanilla extract and eggs, one at a time. Continue beating until fully incorporated.
Add the dry ingredients, one cup at a time, alternating with 1/3 cup of buttermilk.
Pour the hot water and 1 tablespoon of espresso and continue beating for another minute.
Scrape the sides of the bowl and divide batter evenly among 2 cake pans. For exact measurements use a kitchen scale.
Bake for 25-28 minutes, until toothpick inserted in the center comes out mostly clean (some crumbs is OK).
Cool cakes for 15 minutes before transferring to a cooling rack.
Spread Dulce de Leche, straight out of the can, in between layers and on top. Use the back of a spoon or an angled spatula to make swirls. Enjoy!