Sandwich desired amount of mozzarella cheese in between 2 slices of bread.
Heat in the microwave for 20 seconds, to lightly melt the sandwich together.
Set out 2 separate dishes. In one, crack and whisk the egg. In the other, combine the almond flour or breadcrumbs, salt, pepper, and Italian seasoning.
Coat the sandwich in the egg. Then, dip it into the breadcrumb mixture, flipping it to make sure it's thoroughly coated on all sides.
Heat the olive oil in a pan over medium/high.
Fry until golden on all sides. It should only take 1-2 minutes per side.
Serve with marinara sauce.