Texas Sheetcake aka The Pioneer Woman's Best Ever Chocolate Sheet Cake

There are no words to describe how ultimately sinful and delicious this cake is to eat. Best of all, you don't have to grease or use parchment paper, and you don't need a stand mixer. The cake is moist, and the frosting is very rich and fudgy. Don't EVEN try to make it lighter in calories. Just enjoy it.