Bring a pot of water to boil and cook the pasta according to package directions. When the pasta is ready, reserve ½ cup of pasta water, drain the water out, and set aside.
Blend the cottage cheese in your blender until it's smooth. Skipping this step causes the cottage cheese to separate from the tomato sauce. I highly recommend it.
Cook:
Heat a large skillet over medium heat. Once hot, add the oil. Add the chopped onions and cook while stirring, for 2 to 3 minutes, until the onions are soft and translucent. Add the garlic, Italian seasoning, and salt, and cook for another minute until the garlic is fragrant.
Add the crushed tomatoes to the skillet and stir to combine. Bring the tomato sauce to a simmer, reduce the heat to low, cover, and cook, stirring occasionally, for 15 to 20 minutes.
When the sauce is ready, add the smooth cottage cheese and combine. Add the pasta and stir to coat. If the sauce is too thick for your liking, slowly add some of the reserved pasta water to thin it out.
Serve:
Divide the pasta into bowls and serve with parmesan cheese over the top.