If making the pizza in the oven, preheat oven by turning on the broiler and adjust the rack to the middle. If in the toaster oven turn on the toaster to "toast".
Place two pitas on a metal pan. Spread half the marinara mixture ( about 2 tablespoons) on one pita and the rest on the other. Sprinkle the cheese evenly over both pitas leaving about 1/2 inch for the crust.
Place pitas in the oven for 2-3 minutes. Check on them every minute to make sure they don't burn.