In a small saucepan, combine the first 10 ingredients. Bring to a boil. Remove from the heat. Set aside 1 cup barbecue sauce to serve with burgers.
In a large bowl, combine the egg, oats, 1/4 cup of the remaining barbecue sauce, onion salt, garlic salt, pepper and salt. Crumble beef over mixture and mix well. Shape into six patties.
Grill, covered, over medium heat for 6-8 minutes on each side or until a thermometer reads 160°, basting with 1/2 cup barbecue sauce during the last 5 minutes. Serve on buns with toppings of your choice and reserved barbecue sauce.
Recipe adapted from: https://www.tasteofhome.com/recipes/barbecued-burgers.