Instructions Make nacho cheese. In a medium saucepan over medium heat, melt butter and whisk in flour. Pour in milk and whisk until begins to thicken. While whisking, add in salt and cheese. Continue to stir until thickened, 15 minutes. Make taco meat. In a large skillet over medium heat, cook crumbled ground beef, drain juices and add taco seasoning and a splash of water. Assemble Crunchwrap Supreme. In a large pan, toast flour tortillas until warm. Lay flour tortilla on a flat surface and layer in the center: 1/2 cup of taco meat in the center, a thin layer of nacho cheese, 1 tostada, a thin layer of sour cream, shredded lettuce, diced tomato and shredded cheese. Fold the crunchwrap. Take the bottom of the crunchwrap and fold the edge up over the center. Continue to make folds on top of each other over the center of the filling. If any of the center meat is showing, tear a bit of flour tortilla and tuck it under the flour tortilla. Spray a large pan with cooking spray and heat to medium. Place the top of the crunchwrap (folded side) down on the pan and cook until browned (2 minutes). Flip the crunchwrap over and cook until browned.