Preheat oven to 350 degrees.
Grease an 8 inch square pan.
In the 8x8 pan or a mixing bowl combine gluten free flour, sugar, cocoa, baking soda, and salt.
In in flour mixture make one large crater and two small ones.
Add oil to large crater. Add vinegar to one small crater and vanilla to the other one.
Pour water over entire mixture.
With a wooden spoon mix all together until mixture is well combined and no streaks remain.
If mixing in a bowl spread batter into greased pan.
Bake for 30 minutes.
Let cake cool and sprinkle with powdered sugar.
