Boil the pasta per the guidelines on the package until it reaches al dente. Once done, drain and keep aside.
In a spacious pan, melt butter on medium flame. Add flour and stir, cooking until it takes on a faint golden hue (typically 1-2 minutes).
Slowly infuse the milk, continuing to stir. Keep doing so until the mix thickens.
Move the pan off the burner. Blend in the sour cream, garlic powder, and Dijon mustard to the mix.
Warm up the oven to 375°F (or 190°C).
Using a 9×13 baking dish, initiate the layering: start with pasta, followed by sauerkraut, kielbasa slices, and then a portion of the Swiss cheese.
Drench this with half the sauce you prepared earlier.
Repeat the layering process with the remaining pasta, sauerkraut, kielbasa, cheese, and sauce.
Once set, pop the baking dish into the oven for about 30 minutes. The cheese should be molten and the dish should bubble when ready.
Let it settle a bit post baking. Serve the scrumptious Polish Pasta Bake and relish its flavors!
