In a large skillet over medium heat add ground beef. Cook until no longer pink. Drain grease and return beef to skillet.
Continue to cook beef until browned. Add garlic paste, onion powder, salt, tomato sauce, and red pepper flakes. Stir well to combine.
In a separate large skillet over medium-low heat add ½ tbsp of butter and allow to melt.
Place a tortilla in the skillet. Add cheese, beef mixture, then more cheese to the tortilla. Lay another tortilla on the top and spread butter over the tortilla.
Flip the quesadilla over and continue cooking until all of the cheese is melted.
Repeat steps for each quesadilla.