Beef, Blue Cheese and Spinach Quesadillas

1/3 cup cooked lean ground beef
3 Tbsp taco sauce
4 large burrito size wheat flour tortillas
4 oz blue cheese, crumbled (if this is too strong of a flavor, try mixing it with cotija crumbles)
10 oz chopped frozen spinach, thawed and squeezed dry
1/2 tsp red pepper flakes

Stir together beef and taco sauce in bowl. Lay 2 tortillas on a flat surface and divide beef mixture between them. Sprinkle each tortilla with half of the cheese, spinach and red pepper flakes; top each with a remaining tortilla. Place in oven on low broil until brown sports form on tortillas, about 3-5 minutes. 

Serves 8