Preheat your oven to 350 degrees Fahrenheit. This ensures your cake bakes evenly and rises perfectly.
Spray a 9×13 baking pan with pan spray and set it aside. This step is crucial for easy cake removal once it’s baked.
In a large bowl, whisk together the flour, cocoa powder, sugar, baking soda, and salt. Ensure there are no lumps for a smooth batter.
Add the vinegar, vanilla, oil, and water to the dry ingredients. Stir until just combined; over-mixing can make your cake dense, so be gentle!
Pour the batter into the prepared baking pan. The batter will be quite liquid, but that’s how it’s meant to be!
Bake in the preheated oven for 35 to 40 minutes. You’ll know it’s done when the center springs back lightly when touched or a toothpick inserted comes out clean.
Once baked, let the cake cool completely in the pan. This is important for the next step.
To make the whipped cream topping, add the heavy whipping cream, powdered sugar, and cocoa powder to a large bowl. Beat the mixture until medium stiff peaks form; this means it should hold its shape but still be spreadable.
Spread the whipped cream evenly over the cooled cake. This adds a luscious finish to your dessert and makes it look tempting.
Slice, serve, and enjoy the decadent layers of your Wacky Cake! It’s perfect for any occasion.