1 3/4 cups all-purpose flour, plus more for pans
2 cups sugar
3/4 cups cocoa powder
2 teaspoons baking soda
1 teaspoon baking powder
1 teaspoon kosher salt
1 cup buttermilk, shaken
1/2 cup vegetable oil
2 extra-large eggs, at room temperature
1 teaspoon pure vanilla extract
1/2 cup (1 stick) butter, softened
1 cup packed dark brown sugar
1/3 cup heavy cream, plus more as necessary
1 tablespoon pure vanilla extract
1 16-ounce box confectioner’s sugar
milk chocolate frosting
black gel icing
Preheat the oven to 350 degrees. Butter two 8-inch x 2-inch round cake pans. Line with parchment paper, then butter and flour the pans.
Sift the flour, sugar, cocoa, baking soda, baking powder, and salt into the bowl of an electric mixer fitted with a paddle attachment and mix on low speed until combined. In another bowl, combine the buttermilk, oil, eggs, and vanilla. With the mixer on low speed, slowly add the wet ingredients to the dry. Pour the batter into the prepared pans and bake for 35 to 40 minutes, until a cake tester comes out clean. Cool in the pans for 30 minutes, then turn them out onto a cooling rack and cool completely.
Place 1 layer, flat side up, on a flat plate or cake pedestal. With a knife or offset spatula, spread the top with frosting. Place the second layer on top, rounded side up, and spread the frosting evenly on the top and sides of the cake.
Once cake is completely frosted, chill in the freezer for a half hour. Take a butter knife and smear dots (spots) onto your cake with the chocolate frosting sporadically. Once you have done this to the entire cake, freeze for another half hour. Then outline half or 3/4 of each spot with the black gel icing. Refrigerator until service.