Grandma’s old fashioned baked beans

(For any of you who have suffered through a BBQ at my house, this is the recipe for the beans we serve)
1 large (family size) can bush’s original baked beans
1/3 cup chopped onion or 4 Tbsp dried onion.
½ cup firmly packed brown sugar
¼ cup catsup and mustard mixed.
Mix first three ingredients in a glass or oven safe dish. Add catsup and mustard on the top. Mix together, and bake at 350 for 45 minutes. When hot and bubbly, remove and serve.
You can take the time to make the beans from scratch like my grandma always did, but any can of premade baked beans works just as well and saves you some time. You can also just microwave this dish, but it won’t thicken up like it does in the oven. another way is to do this in a crockpot or slow cooker. It will thicken up nicely as it cooks.