Heat a skillet over medium heat on the stovetop.

Spray the skillet with cooking spray.

Pour half of the egg whites into the skillet. Season with half of the onion powder, salt, and pepper to taste.

Top the egg whites with some of the spinach, bacon, and cheese.

Place a tortilla on top of the egg white mixture while it is still wet and press down gently.

Continue to cook until the egg whites are cooked through and done to your liking.

Flip the quesadilla so the tortilla is now on the bottom.

Sprinkle more spinach, bacon, and cheese on one half of the egg whites.

Fold the tortilla over to form a closed quesadilla.

Sauté on each side until the tortilla is browned and crispy.

Repeat with the remaining egg whites, onion powder, spinach, bacon, cheese, and tortilla to make the second quesadilla.

Slice into pieces before serving.