Coat a broiler-safe 9-by-13-inch baking dish with cooking spray.
Heat oil in a large pot over medium heat.
Add kielbasa and cook, stirring occasionally, until crispy, about 2 minutes.
Photo: Diana Chistruga
Stir in sauerkraut, mustard, pepper and salt.
Sprinkle with flour and cook, stirring constantly, until well incorporated, about 1 minute.
Remove from heat and stir in 1 1/2 cups cheese.
Stir in the chicken.
Transfer to the prepared baking dish.
Sprinkle with the kielbasa, breadcrumbs and the remaining 1/2 cup cheese.
Bake on the center rack until bubbling and the chicken is completely cooked through, about 20 minutes.
Turn the oven to broil and move the casserole to the top rack.
Broil until browned on top, about 1 minute.
Let stand for 5 minutes before serving.
- Daily Values (DVs) are the recommended amounts of nutrients to consume each day.
(-) Information is not currently available for this nutrient.
