Baked Ziti and Sausage

0 Cook pasta according to the directions on the package.
2 Preheat the oven to 350 degrees F.
3 Oil a 9x13 baking dish. Set aside.
21 Add 1 tablespoon of olive oil to the skillet and heat until shimmery. Turn heat down to medium.
4 Put the onion in the hot oil and cook for 2-3 minutes - until just starting to get transparent.
6 Add the breakfast sausage. 
22 With a wooden spoon, cook and break into pieces until completely cooked, no more pink, approximately 8-10 minutes.
7 Spoon the cooked sausage and onion into the prepared 9x13 baking dish.
8 Pour the Rotel evenly over the sausage.
9 Sprinkle the cheese over the tomato. Set aside.
10 You can sprinkle the cheese on top of the pasta as well, but the mixture of the cheese with the sausage makes every bite even more ooey-gooey. Remember the pasta will be covered with a sauce.
11 In the skillet, over medium heat, add the butter and melt completely. 
23 Scrape the side to bring all the leftover pieces of sausage and onions down into the butter.
12 Once the butter is all melted, add the flour and whisk constantly until you have a paste.
13 Slowly add the milk while whisking.
14 Once the milk is added, add the Golden mushroom soup. Whisk until blended.
15 Add the spices and mix. You will have a nice thick sauce, you may need to reduce the heat to medium-low - don’t boil the sauce!
16 Add the Parmiggiano and mix until all ingredients are blended.
17 Add the cooked pasta into the sauce, mixing in between scoops to make sure it's all covered in sauce.
18 Place pasta over the sausage in the casserole dish and cook in the preheated oven for 15 minutes - or until heated through.
19 You could add some cheese on top if you want, but the sauce and the cheese already in the mixture are a perfect blend.