Preheat your oven to 350°F (175°C).
In a skillet, cook the chopped bacon over medium heat until crisp. Remove and set aside.
In the same skillet, sauté the onion and green bell pepper in the bacon drippings until softened.
In a large mixing bowl, combine pork and beans, brown sugar, ketchup, barbecue sauce, and mustard. Stir in the cooked bacon, onions, and peppers.
Pour the mixture into a 9x13-inch baking dish and bake for 1 hour, uncovered, until bubbly and slightly thickened.