Preheat oven to 350F / 180C and grease two 6-inch cake pans. You may also use pan(s) of your choice.
In a large bowl, whisk together oil, milk, applesauce, and sugar.
Into the wet mixture, sift in the flour, cocoa powder, baking powder, baking soda, and salt. Fold to combine with a spatula until no lumps of flour remain
Distribute the batter evenly between the pans.
Bake for 45 minutes, or until the center has mostly set. Let the cake cool in the pans for 5 minutes before transferring to a wire rack.
Make the frosting: combine all the frosting ingredients in a food processor and blend until smooth. Alternatively, mash everything together by hand. Place in the fridge to chill. When ready, decorate the cake as desired and enjoy!