In a large bowl mix hamburger, oats, onion, salt, pepper, and seasoning saltand then cook in a large skillet over medium heat until hamburger is fully browned.
Sprinkle with 1 /4 cup flour and stir.
Add 1 ½ cup ketchup, 1 teaspoonWorcestershire sauce, ½ teaspoon liquid smoke, 2 tablespoons mustard, and ½cup brown sugar(or maple syrup)… you can adjust any of these ingredients to satisfy your own taste buds.
Simmer 10 minutes of medium low.
Spoon onto buns and make sloppy joe casserole sandwiches or just eat off the plate!