Make Ahead: Prep all the ingredients, without placing them onto the baking sheet. Store in the refrigerator up to 2 days. When you are ready to serve, preheat the oven with the rimmed baking sheet in it and then proceed with the rest of the steps.

Notes
You can use any cooked sausage that you like. I buy my sausage from a local Polish store, where they make their own sausage. It is SO delicious. The sausage that I used this time had a really smoky flavor, so it gave that same smoky flavor to the rest of the vegetables. However, you can use any kind of sausage that you prefer.