We always have this with Kraft macaroni and cheese as a side dish. ALWAYS. It's the law.
2 lbs. kielbasa or smoked sausage
1 c. brown sugar
6 Tbsp. spicy brown mustard
Combine brown sugar and mustard in crockpot. Cut kielbasa into bite sized pieces. (You could cut it into bigger pieces and put toothpicks in them, if serving as an appetizer.) Add kielbasa to crockpot. Stir to coat. Cook on low 2-1/2 to 3 hours on low or 1 to 1-1/2 hours on high. (Alternatively, you could cook this on the stove.)