Desserts · Part 2 of 3: Instructions
Rich and Moist Black Sheet Cake for Any Occasion Step-by-step instructions

- Prep
- Cook
- Total
- Serves
- 12
Before you start
Before beginning, ensure that your workspace is clean and that all necessary equipment is within reach. Preheating the oven is essential; verify the temperature with an oven thermometer if possible to avoid any fluctuations that could affect the rise of the cake.
Have your baking pan greased and lined with parchment paper if desired for easier removal. Gather all your ingredients and measure them accurately. Preparing these components in advance will allow the process to flow smoothly and efficiently.
Ingredients at a glance (2)
- 1 box chocolate cake mix, store-bought or made ahead
- 1 cup chocolate glaze, store-bought or made ahead
Instructions
Mixing and Baking
- Prepare the cake basePrepare the chocolate cake mix according to the package instructions. Pour the batter into a greased 9x13 inch baking pan and bake until a toothpick inserted into the center comes out clean.Look for The cake should spring back when lightly touched in the center.Safe temperature 160°F (71°C) internal temperature (egg dishes)Tip Ensure the oven is fully preheated before placing the cake inside for an even rise.
At the end of this phase, the cake should have risen evenly and possess a deep, dark color. The surface should be smooth and set, with no wet patches of batter remaining. Check that the edges are just beginning to pull away from the sides of the pan, which indicates that the cake is ready to be removed from the oven and placed on a wire rack to cool down.
Glazing
- Cool and glaze the cakeAllow the cake to cool completely in the pan on a wire rack. Once cooled, pour the chocolate glaze over the surface and spread it evenly using an offset spatula to ensure full coverage.Look for The glaze should be smooth and glossy across the entire surface of the cake.Tip Let the glaze set for at least 30 minutes before slicing to achieve clean edges.
Once the cake is fully cooled, the glaze should be applied. The finished result should look mirror-like and smooth. Ensure the glaze covers the entire surface right to the edges of the pan. Check that there are no gaps or uneven ridges. If the glaze appears too thin, allow it to rest for a few more minutes at room temperature to thicken slightly before spreading it over the cake.
Slicing and Serving
- Serve the dessertSlice the cake into uniform squares using a sharp knife. Gently lift each square with a spatula and place it onto a serving plate for immediate enjoyment.Look for The crumb should be tender and moist when lifted.Tip Wipe the knife blade with a warm cloth between cuts for professional looking slices.
After the glaze has set, the cake is ready for slicing. The final product should feature clean, sharp edges on each square. When lifted, the slice should hold its shape perfectly without crumbling.
The interior should appear moist and dark, indicating that the cake has been properly prepared and cooled. Ensure each piece is placed carefully on a plate to maintain its presentation before serving to your guests.
Common mistakes
A common mistake is overbaking the cake, which can lead to a dry, crumbly texture that lacks the desired moisture. Always set a timer and begin checking for doneness a few minutes before the suggested time.
Another error is applying the glaze while the cake is still warm; this causes the glaze to seep into the cake rather than sitting on top as a distinct, glossy layer. Be patient and allow the cake to cool completely before proceeding with the final steps.
How to tell it’s done
The cake is done when the top feels firm yet springy to the touch and a toothpick inserted into the center comes out clean or with only a few moist crumbs.
Because this recipe contains eggs, it must reach an internal temperature of 160°F (71°C) to ensure it is cooked through. The glaze should be set and no longer tacky to the touch before you attempt to slice the cake, which typically takes about 30 minutes at room temperature.
- Egg dishes: 160°F (71°C) in the thickest part
Up next · Part 3 of 3
2 variations · storage & make-ahead · 3 answers · printable card
Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)