Brown ground chuck in large skillet, drain fat, add tomato sauce, ½ tsp salt and black pepper. Stir and simmer while you prepare the other ingredients.
Cook egg noodles until al dente. Drain and set aside in a large bowl. Add sour cream, cottage cheese and onions to the noodles and stir
To assemble, add half of the noodles to the baking dish. Top with half of the meat mixture, then sprinkle with half of the grated cheddar. Repeat the layers and bake for 20 minutes until all of the cheese is melted.