In a ramekin, mix all the dry ingredients for the cake (except blueberries if using).
Add the wet ingredients and mix until well combined. Add blueberries and mix.
Use a spoon to even out the thick batter.
For the crumb, mix all the dry ingredients, then add coconut oil. Using your hand, mix all the ingredients till the coconut oil is well distributed. Dont over mix as the oil will start to melt.
Drop the crumb on top of the cake batter.
Microwave:
Microwave on high for 1 minute (60-65 seconds).
Bake:
Bake at preheated 365 degrees F for 15-18 minutes.
Dig in after cooling for half a minute!
Notes
Nutritional values based on one serving (whole recipe)