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Preheat the oven to 375°F and lightly grease a baking dish or small sheet pan.
Spread the kielbasa slices in a single layer in the prepared baking dish.
Spoon or drizzle the yellow mustard evenly over the kielbasa slices, coating the tops lightly.
Sprinkle the mozzarella cheese over everything, making sure each slice gets a good layer.
Bake for 15 to 20 minutes, until the cheese is melted and bubbling and the edges of the kielbasa are browned. Serve hot.