Preheat the oven to 350°F (175°C).

Combine chopped spinach and crumbled feta cheese in a mixing bowl.

Spread the mixture evenly onto half of each flour tortilla.

Fold the tortillas over to create quesadillas.

Heat olive oil in a skillet over medium heat and cook the quesadillas for 3-5 minutes on each side until golden brown.

Transfer the cooked quesadillas to a baking sheet and place in the oven for an additional 5 minutes to crisp.

Remove from the oven, let cool slightly, then cut into wedges and serve.