Cook Spaghetti: Prepare the spaghetti according to package instructions until al dente. Drain and set aside.
Prepare Meat Sauce:
In a large skillet, cook the ground beef over medium heat until browned.
Add chopped onion and minced garlic; sauté until the onion is translucent.
Stir in the spaghetti sauce and let it simmer for about 10 minutes.
Assemble the Casserole:
Spray a 9×13-inch baking dish with nonstick cooking spray.
Layer half of the cooked spaghetti in the dish.
Spread half of the cottage cheese over the spaghetti.
Sprinkle with half of the mozzarella cheese.
Pour half of the meat sauce over the cheese layer.
Repeat the layers with the remaining ingredients.Food.com
Bake:
Cover the dish with aluminum foil and bake for 45 minutes.
Remove the foil, sprinkle the grated Parmesan cheese on top, and bake uncovered for an additional 10 minutes, or until the cheese is melted and bubbly.
Serve: Allow the casserole to cool for about 10 minutes before serving.