01 - Set the oven to 350°F and allow it to preheat fully.
02 - In a large skillet over medium heat, cook the ground beef, breaking it apart, until evenly browned. Drain off excess fat.
03 - Add the chopped onion and minced garlic to the skillet. Sauté until onions are soft and translucent, about 2 to 3 minutes.
04 - Incorporate diced tomatoes with juices, tomato sauce, tomato paste, Italian seasoning, salt, and black pepper into the skillet. Stir to combine and simmer gently for 10 minutes.
05 - Cook egg noodles in a large pot of boiling salted water according to package directions until al dente. Drain well.
06 - In a mixing bowl, blend together sour cream and cottage cheese until evenly combined.
07 - Lightly grease a 9x13 inch casserole dish. Arrange half of the cooked noodles in an even layer, spread with half the sour cream and cottage cheese mixture, and top with half the beef sauce. Repeat the layering sequence.
08 - Sprinkle shredded cheddar cheese evenly over the top. Bake uncovered in the preheated oven for 25 to 30 minutes, until the top is golden and the casserole is bubbling.
09 - Allow the casserole to rest for 10 minutes before portioning and serving.