Cook broccoli according to the package directions, chop into smaller pieces.
Place the broccoli onto four of the flour tortillas. Sprinkle each with 1/4 cup of shredded cheese.
Place the remaining flour tortillas on top of the broccoli and cheese. Heat a medium skillet over medium-low heat. Grease with non-stick cooking spray. Cook until quesadilla is lightly browned. Flip and cook until the other side is lightly browned and the cheese has melted.