Preheat your oven to 200C/400F. Use the fan assist or convection setting if you have it. Otherwise, just use the regular oven setting.
Prepare a baking pan with a wire baking rack on top. Spray baking rack with nonstick cooking spray. Put foil or baking paper on the pan for easier cleanup.
Make sure your fish is nice and dry. Cut it into strips.
Make your wet batter. Mix egg, mustard, 1 tbsp of tapioca flour, and 1/2 tsp of salt/paprika.
Put fish into the wet batter. Mix well to combine.
In a separate bowl, mix the almond and tapioca flour, 1 tsp of salt, oregano, onion, garlic powder, and 1/2 tsp of paprika.
Take a piece of fish coated in the egg/mustard batter and place it into your flour mixture.
Place on to your wired baking rack.
Continue these steps until all fish is coated in flour mixture.
Bake for 18-20 minutes or until your fish is cooked through. Cooking times will vary depending on how big your pieces are and your oven.