Choose the mug/jar that the cake will be cooked in. A coffee mug is the ideal size. A smaller mug/jar will work, but it might spill over a bit in the microwave.
In the mug/jar, combine the sorghum flour, millet flour, sugars, baking powder, vanilla powder, and salt. Stir until well mixed.
Add the orange juice and oil. Stir until well mixed.
Sprinkle the chocolate chips over the batter. Do not stir.
Microwave on full power for 1 minute. Check the doneness of the cake. If it is under cooked, microwave for up to 1 more minute.
Recipe Notes
Notes: An equal amount of vanilla extract can be substituted for vanilla powder. If using vanilla extract add it with the orange juice and oil.