Boil orange for 20 minutes
Place boiled orange in blender with eggs, oil, honey, vanilla, and salt
Blend until smooth to create wet batter
Sift oat flour and baking powder into a bowl
Add wet batter to the dry ingredients
Cover bowl with a towel and let it sit at room temperature for 10 minutes
Pour batter into a baking dish
Bake at 350F for about 45 minutes
Let cake cool on the counter for an hour
