1-Getting started with this Mini Texas Sheet Cake is easy and rewarding. First, lightly spray a quarter sheet pan with nonstick cooking spray and preheat the oven to 350°F (175°C) to set the stage for a perfect bake. In a large bowl, whisk together the flour, sugar, cocoa powder, salt, and baking soda until well mixed and lump-free.

2-Next, melt the butter in a microwave-safe container in 30-second intervals until fully melted, then let it cool slightly for safe handling. Whisk the egg, vanilla, buttermilk, and water into the melted butter until you get a smooth mixture that blends perfectly. Combine the wet and dry ingredients, mixing just until an even batter forms to keep the cake light and not dense.

3-Pour the batter into the prepared pan and bake for 15-16 minutes, or until a toothpick inserted in the center comes out clean check around 15 minutes to avoid overbaking. While the cake bakes, prepare the frosting by melting the butter in a medium saucepan over medium heat, then whisk in the cocoa powder, buttermilk, vanilla extract, and salt until smooth.

4-Remove the frosting from heat and whisk in the powdered sugar until fully combined, creating a glossy finish. Immediately pour the frosting over the hot cake and spread it evenly for that classic sheet cake look. Let the cake cool for at least 30 minutes before slicing into 12 pieces, giving you a total preparation and cooking time of about 30 minutes. For a time-saving twist, you can even make the frosting in the microwave to cut down on dishes.