Drunk Turkey Bites

Heat oil in a skillet over medium heat. Cook and stir kielbasa and onion in hot oil until the onion begins to soften, about 5 minutes.

Gently whisk beer, brown sugar, and mustard together in a bowl; pour into the skillet.

Bring the mixture to a boil and cook until the volume of the liquid reduces by half, about 15 minutes. . Season with salt and pepper.