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Devil's Food Cake with Chocolate Swiss Meringue Buttercream

This is the best homemade chocolate cake with chocolate frosting that I've tried so far. My new go-to! The frosting takes a bit of technique, but it comes together super easily since it's a sheet cake!
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Ingredients
  

For Devil's Food Cake

  • 2 cups all purpose flour
  • 1 tsp salt
  • 1 tsp baking powder
  • 2 tsp baking soda
  • 3/4 cup unsweetened cocoa powder
  • 2 cups granulated sugar
  • 1 cup vegetable oil
  • 1 cup coffee brewed & hot
  • 1 cup milk I used Flax Milk from Good Karma
  • 2 eggs large
  • 1 tsp vanilla extract

For Chocolate Swiss Meringue Buttercream

  • 2/3 cup granulated sugar
  • 4 large egg whites
  • 1/4 teaspoon salt
  • 3 sticks unsalted butter room temperature
  • 12 ounces semisweet chocolate melted & cooled
  • 1 teaspoon vanilla extract

Instructions
 

For Devil's Food Cake

  • Preheat oven to 325℉ and grease 9x13in sheet pan and line with parchment paper.
  • Sift together dry ingredients (flour, cocoa powder, salt, baking powder, soda, sugar) in large bowl.
  • Add oil, milk, and hot coffee and mix until blended, about 2 minutes.
  • Add eggs and vanilla extract and mix for 2 more minutes. Batter will be very runny. Don't be scared!
  • Pour into prepared pan and bake for 45 minutes (30 minutes if using two 8 or 9 inch circle cake pans) or until an inserted toothpick comes out clean.

For Chocolate Swiss Meringue Buttercream

  • Combine the sugar, egg whites, and salt in the bowl of your stand mixer. Set bowl over a saucepan filled with 1-inch of gently simmering water. Whisking constantly until sugar is dissolved and mixture is thicker and foamy and reaches 150°F.
  • Using a stand mixer with a whisk attachment, beat the egg white mixture on medium speed until slightly cooled and thickened, about 2 minutes. Add butter, 1 tablespoon piece at a time, until smooth and creamy. If the frosting becomes too warm and greasy, refrigerate the bowl for 10 to 15 minutes then continue to beat until smooth.
  • Add chocolate and vanilla extract and mix until combined. Increase speed to medium-high and beat until light, fluffy, and well combined.
  • Frost cake when cooled, add sprinkles, and enjoy!