Preheat the oven to 350°F (177°C).
Grease two 8-inch pans or one 9×13-inch pan and set aside.
In a large mixing bowl, stir together the flour, cocoa powder, baking soda, salt, and sugar or sweetener.
If using almond butter, warm it slightly until soft and easy to mix.
In a separate bowl (or use the same one to minimize dishes), whisk together the wet ingredients: applesauce, oil, vanilla extract, water, vegan red food coloring, and vinegar if using.
Pour the wet ingredients into the dry ingredients and gently stir until just combined. Avoid overmixing to keep the cake light and fluffy.
Distribute the batter evenly into the prepared pan(s).
Bake for 28 minutes, or until a toothpick inserted in the center comes out mostly clean.
Allow the cake to cool in the pan for at least 30 minutes. For easier frosting, refrigerate the cake until firm.
Once cooled, invert the cake onto a plate, frost, stack if making a double layer, decorate as desired, and enjoy!