Cook ground beef with taco seasoning and add a scoop of the cook ground beef in the middle of the flour tortilla, living plenty of room around the sides to fold the tortilla in. Add in a scoop of queso on top of the beef.
Place the tostada shell on top and spread a dollop of sour cream on the tostada shell. Add some shredded lettuce, diced tomatoes, and shredded cheddar cheese on top of the tostada shell.
Fold in the outer edges of the large tortilla.
Carefully transfer to the skillet and cook over medium to low heat until lightly browned. Enjoy!