Set your oven temperature to 350 degrees Fahrenheit and lightly coat a 9x13-inch baking dish with nonstick spray.
Cut the smoked sausage into 1-inch thick slices.
Combine the sliced sausage, barbecue sauce, brown sugar, and dijon mustard directly in the baking dish and mix until evenly coated.
Place the dish in the oven and bake for 45 minutes, stirring a couple of times during cooking to ensure all sausage pieces are well covered with sauce.
Once the sauce bubbles and thickens with a deeper color, remove from oven.
Serve the sausage bites hot with toothpicks, perfect as an appetizer or alongside kid-friendly dishes like mac and cheese.
To keep warm for parties or game day, bake as usual, then transfer to a slow cooker set to WARM for 2 to 3 hours to maintain heat and flavor.