Prepare noodles according to package instructions.
Heat oven to 350 degrees. Dice veggies and kielbasa.
Heat oil in cast iron skillet and saute onion for 5 minutes or until brown.
Add garlic and cook 1 minute.
Add kielbasa and heat 4-5 minutes or until browned. Stir regularly.
Pour in marinara and half of the basil. Cook 2-3 minutes or until bubbly.
Add sour cream and turn heat to low. Stir continuously until creamy and bubbling.
Put in noodles and stir to combine. Top with optional cheeses.
Bake at 350 for 5 minutes or until cheese is melted. Top with remaining basil.