Preheat oven to 375°F.
In an 8x8 baking dish, combine the baked beans, bacon, diced onion, barbecue sauce, brown sugar, and Dano’s Sweet & Tangy Barbecue Outlaw Seasoning.
Stir everything together directly in the baking dish until well combined.
Drizzle the yellow mustard lightly over the top — just a little razzle-dazzle drizzle.
Sprinkle the remaining seasoning evenly over the top.
Bake uncovered for 40–45 minutes, or until the beans are hot, bubbly, and slightly caramelized around the edges.
Remove from the oven and serve warm.