01 -
In a medium bowl, combine the diced tomato, red onion, chopped spinach, feta cheese, and mozzarella cheese. Mix until evenly distributed.
02 -
Place one third of the filling mixture onto one side of each tortilla. Fold each tortilla in half to enclose the filling.
03 -
Heat 1 tablespoon of oil in a large skillet or on a griddle over medium heat. Place the folded tortillas onto the cooking surface. Cook each side for 3 to 4 minutes, pressing gently with a spatula, until golden brown and the cheese has melted.
04 -
Cut each quesadilla into four wedges using a sharp knife or pizza cutter. Serve immediately while hot.