Mix the first four ingredients together in a medium-sized bowl until well incorporated.
Pour batter evenly between two greased 9-inch round pans.
Bake at 350 degrees for 30 minutes.
Use toothpick to check for doneness by inserting into the middle of the cake. Toothpick should come out clean.
Let cakes cool on wire rack for 10 minutes before removing cake from pans.
Remove cakes from an and let cool completely before frosting, about 1 hour.
Place one of the cakes on a plate and spread about ¾ of one can of frosting on the top of the cake. Place the second cake on top and use the remaining frosting to coat the top of the cake, and the sides.
Recipe by Smashed Peas & Carrots at https://smashedpeasandcarrots.com/portillos-chocolate-cake-recipe/