Cook the ground beef in a skillet over medium heat until fully browned. Drain excess fat.
Stir in taco seasoning and a splash of water; simmer until thickened and flavorful.
Lay a large flour tortilla flat and spread a spoonful of nacho cheese sauce in the center.
Add a layer of the seasoned ground beef on top of the cheese sauce.
Place a crispy tostada shell over the beef layer.
Spread sour cream over the tostada shell, then add shredded lettuce, diced tomatoes, and shredded cheddar cheese.
Fold the edges of the flour tortilla up around the filling, creating a hexagonal shape and sealing all sides.
Heat a clean skillet over medium heat and carefully place the folded wrap seam side down.
Cook for 2-3 minutes until golden brown and crisp, then flip and cook the other side similarly.
Remove from heat, place flat on a plate, and cut in half to show the layered inside.