Step 1

Preheat oven to 350° Fahnrenheit.

Step 2

Cook spaghetti in salted water 1 minute shy of al dente. Pasta will continue to cook as casserole bakes, so it is important not to over cook. Drain in colander. Toss in butter. Set aside.

Step 3

While pasta cooks, begin to brown beef and sausage together on the stovetop in a large skillet or dutch oven. Add diced onion as meat browns. When browned, drain any excess fat, then return meat to skillet. Add crushed tomatoes and tomatoe sauce, along with Italian seasoning, garlic, salt, & pepper. Let simmer over low heat for 5 or so minutes.

Step 4

As meat sauce simmers, mix together all the ingredients for the "ultimate cheese layer" in a medium bowl or large measuring cup.

Step 5

Spray a large casserole dish with non stick cooking spray. Spread a thin layer of meat sauce in the bottom of the dish. Assemble as follows:Layer 1- Add 1/2 of spaghetti to bottom of dish. Use a fork or tongs to spread over the entire bottom of the dish.Layer 2- Spread all of the cheese mixture over the noodles.Layer3- Use a fork or tongs to layer the rest of the noodles evenly over the "ultimate cheese layer," making sure that the noodles spread all the way out to the edges of the dish.Layer 4- Spread the rest of the meat sauce evenly over the last layer of noodles.Layer 5- Top with shredded mozzarrella and dried parsley.

Step 6

Baked in preheated oven for 35-45 minutes.