Heat 1/2 tablespoon of olive oil in a skillet over medium heat and sauté minced garlic for 30 seconds until fragrant.
Add chopped spinach to the skillet and cook until wilted, approximately 2 minutes. Remove spinach and press between paper towels to remove excess moisture.
Wipe the skillet clean and return to medium heat with the remaining olive oil.
Place one tortilla in the skillet and distribute half of the mozzarella, feta, sautéed spinach, and sundried tomatoes over one half of the tortilla surface.
Sprinkle with dried oregano and fold the tortilla in half to cover the filling.
Toast for 2 to 3 minutes per side until the exterior is golden brown and the internal cheese has fully melted.
Repeat the process for the second tortilla using the remaining ingredients.
Slice each quesadilla into three triangular wedges and serve immediately.