In a large skillet, brown 1 lb ground beef over medium-high heat. Drain off any excess grease.

Add 1 diced yellow onion and 1 diced green bell pepper to the skillet. Cook until softened, about 5 minutes.

Stir in 1 (15 ounce) can of tomato sauce, 1/2 cup ketchup, 2 tablespoons brown sugar, 1 tablespoon Worcestershire sauce, 1 teaspoon yellow mustard, 1/2 teaspoon garlic powder, 1/4 teaspoon chili powder, and salt and pepper to taste.

Bring the mixture to a simmer, then reduce heat to low. Cover and cook for 15 minutes, stirring occasionally, to allow the flavors to meld.

Serve hot on toasted hamburger buns. Garnish with your favorite toppings such as pickles, coleslaw, or shredded cheese.