First, spread 1-1.5 Tbsp tomato sauce on the slices of bread and sprinkle 1/4 cup mozzarella cheese on top. You can add your favorite toppings but remember keep it simple. Bake at 350 degrees F for 10 minutes in a toaster oven until cheese is bubbly. Carefully remove from oven and sprinkle parmesan cheese on top. Cool for 2 minutes and enjoy!