Preheat the oven to 175 degrees Celsius.
Add egg, stevia granulated sugar, stevia vanilla drops and melted coconut oil to a blender or bowl and mix/whisk until lightly beaten.
Add apple sauce, Greek yogurt and milk and mix/whisk again until smooth.
Combine oat flour, rice flour, baking soda, baking powder, salt and saffron in a bowl.
Add little by little to the wet ingredients mixing/whisking in between. Mix/whisk just until combined, don't over mix.
Fold in the raisins (if using).
Divide the batter between the muffins tins and bake in the oven for 17-20 minutes, depending on how big your muffin tins are.
Take out from the oven and let them cool.