Preheat the oven to 350 degrees.
Cook the pasta in boiling salted water for 7 minutes and drain.
While the pasta is cooking, start making the sauce.
In a large pot heat, the olive oil in the pan add the sausage, and cook all the way through. Remove the sausage from the pan and slice then set them aside. Add the garlic to the pot, cook for 2 minutes.
Add the tomato sauce, diced tomatoes, and tomato paste to the pot with the garlic and simmer for 2-3 minutes. Add the Italian seasoning, salt, sugar, spinach, and cottage cheese simmer for a few minutes. Add in the sausage and cooked pasta and mix well.
Coat a 9″x13″ pan with cooking spray and pour the pasta mixture in. Sprinkle the cheese on the top of the pasta. Place in the oven for 40 to 45 minutes, until the cheese is golden brown.