In a skillet, cook ground beef and onion over medium heat until meat is no longer pink; drain.1 pound ground beef,1 large onion.
In a large bowl, mix together the cooked beef and onions, baked beans, ketchup, brown sugar, Worcestershire sauce, mustard, garlic powder, salt, and pepper.4 (12 ounce cans) baked beans,3/4 cup brown sugar,1/2 cup ketchup,2 tablespoons Worcestershire sauce,1 tablespoon mustard,1 teaspoon garlic powder,1 teaspoon salt,1/4 teaspoon black pepper.
Transfer the mixture to a greased baking dish.
Bake uncovered for 1 hour and 15 minutes, or until bubbly and heated through.
Notes
This makes 8 cups of beans total, which feeds 8 people as a generous side dish. I would say smaller servings you could get at least 12 servings from it. For a larger crowd double the recipe and use two casserole dishes rather than one deeper pan.