Add the cake mix and water to a small bowl and stir to combine.
Pour the cake batter into the cake pan.
Place the cake pan on a baking sheet and bake for 12 to 15 minutes or until a toothpick inserted into the cake comes out clean.
Remove to rack and allow to cool.
In another small bowl, add the coconut oil, powdered sugar and vanilla.
Whip with a whisk to create a light frosting.
When the cake is cool and removed from the cake pan, plate and frost.
Lightly sprinkle cacao powder over top.
Notes
A 3-2-1 cake combines 1 angel food cake mix with 1 standard cake mix in a large zip top bag. Then you simply place 3 tablespoons of cake mix in a microwave safe coffee mug, add 2 tablespoons of cold water, mix and microwave it for 1 minute.
Recipe by Cooking 4 One at https://www.cooking-4-one.com/2016/11/19/cake-for-one/