Bring a pot of water to a boil and cook the pasta according to package directions.

Heat the olive oil over medium heat in a large skillet. Add the sliced kielbasa and cook it until it starts to brown and crisp on each side, approximately a couple of minutes on each side. Remove the it from the pan.

In the same pan, add the onions. Add the wine and, as it bubbles, scrape up the browned bits off the bottom of the pan. Add the thyme and stir it until the wine has mostly evaporated.

Add the butter, and once it's melted, add the cream and mustard and stir. Bring it to a low simmer for a few minutes or until it thickens. Add the Parmesan cheese and stir until the cheese is melted and the sauce coats the back of a spoon.

Add the cooked pasta to the mustard cream sauce and stir to combine. To serve, either mix the sausage into the pasta or top each serving of pasta with some sausage.