1. Start by gathering your ingredients in a medium mixing bowl. Combine the shredded mozzarella cheese, crumbled feta cheese, chopped spinach, diced tomato, red onion, sliced kalamata olives, and dried oregano. Mix everything thoroughly until the components are evenly distributed.

2. Lay each flour tortilla flat on your work surface. Distribute the filling across one half of each tortilla, leaving about a quarter-inch border. Fold the empty half over the filling to create a neat half-moon shape.

3. Heat the olive oil in a large skillet over medium heat until it shimmers slightly. Carefully place your first Mediterranean Quesadilla in the hot skillet. Cook for three to four minutes on the first side, pressing gently with a spatula. Flip carefully and repeat on the second side.

4. Remove your finished Mediterranean Quesadilla from the skillet and let it cool for about a minute. Cut diagonally into triangular pieces—typically three or four pieces per quesadilla. Serve immediately while warm.