1 16oz package kielbasa, thinly sliced
2 medium onions, sliced into strips
2 medium bell peppers, sliced into strips
3-4 cloves garlic, smashed and chopped
3 c. pasta or marinara sauce (you can use 1 regular sized jar instead)
1/2 package lasagna noodles or 1/2 bag egg noodles (or pasta of choice)
1 c. shredded mozzarella cheese
Cook noodles according to package directions. If you use lasagna noodles, break them up into pieces about 1" square and scatter them in the water. Reserve 1 c. of the starchy pasta water before draining.
In a wok or large skillet, heat pan on high. Add kielbasa and stir occasionally, letting it brown well on both sides. Add peppers and onions, reduce heat to medium, and cook another 5-10 minutes until softened. Add the sauce, and the cooking liquid. If you use a jar, swirl cooking liquid around the jar to release sauce on the sides. Stir well.
Add the noodles and toss to coat in the sauce. Top each serving with a sprinkle of mozzarella, and crushed red pepper flakes.
This is also great if you substitute a pound of Italian sausage for the kielbasa.