In a large saute pan over medium high heat, add ground beef. Cook until no longer pink.
In a small bowl, whisk together tomato paste, taco seasoning, broth and corn starch. Add to cooked beef and bring to a bubble.
Add pinto beans and stir to combine. Reduce heat and let simmer until sauce thickens.
Preheat oven to 425degF. Prepare a baking sheet covered in parchment paper under a wire rack.
Spray one side of the tortilla half with cooking spray and place oil side down on surface. Add a portion of meat & bean mixture to the center of the tortilla and top with a generous amount of cheese. Fold the corners of the tortilla (from the longer side) over to make a triangular pocket out of the tortilla. Place seam side down on the wire rack. Repeat with remaining tortillas.
Sprinkle a bit of cheese over each quesadilla. Bake in oven for 20 minutes (or until golden on the top).
Remove from oven and let rest for 5 minutes before serving with your favorite toppings (sour cream, salsa, hot sauce, etc)