Clean the shrimp by removing the shells and veins.
Thinly slice the onion and bell pepper.
Spread tomato sauce evenly over the tortilla.
Evenly add onions, bell peppers, and shrimp on top.
Sprinkle mozzarella cheese.
Place the tortilla in a preheated pan, cover with a lid, and cook over medium-low heat until the cheese melts.
Sprinkle parsley flakes to taste and cut into bite-size pieces.