Try this I Want Chocolate Cake recipe
Operating under the constraint of a single 8-inch square pan, this recipe requires strict adherence to pan material rules. Dark metal pans absorb heat faster, which means baking times must be adjusted downward by roughly five to ten minutes compared to shiny aluminum. Sifting the cocoa powder, flour, baking soda, baking powder, and fine sea salt together is non-negotiable; skipping this step leaves pockets of alkali that react unevenly with the dairy.
Achieving the correct crumb relies entirely on alternating the addition of dry ingredients and buttermilk. Adding the liquid in three separate intervals prevents gluten strands from overdeveloping, which would otherwise yield a tough, rubbery structure instead of a tender cake. Incorporating melted unsweetened chocolate directly into the batter provides the primary structural fat and solids, while the buttermilk adds acidity to tenderize the protein network. Beat the room-temperature butter and sugars at medium-high speed for precisely two to three minutes to incorporate enough air pockets for the chemical leaveners to expand.
The frosting presents a separate textural challenge. Processing the powdered sugar, butter, salt, cream, and vanilla in a food processor yields a remarkably smooth emulsion without the aeration of a stand mixer. Because this specific frosting sets up rapidly due to the high sugar-to-fat ratio, application must happen immediately after processing. If preparation must be delayed, seal the bowl tightly with plastic wrap pressed directly against the surface to prevent a crust from forming.
Leftovers remain structurally stable at room temperature for up to two days when covered securely. Refrigeration extends storage up to one week, though the butter content will firm the crumb considerably.