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Start by cooking spaghetti according to package directions.
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While spaghetti is cooking, in a separate pan, sauté onions and garlic over medium heat until they start to soften.
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Add ground beef and cook, breaking up with a wooden spoon while it browns.
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Season ground beef as it cooks with 1 teaspoon of salt and pepper to taste.
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Once ground beef has cooked through, add crushed tomatoes, tomato sauce, and low-sodium chicken broth.
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Season with additional teaspoon of salt and pepper to taste.
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Let simmer while pasta finishes cooking.
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Drain pasta and preheat oven to 350 degrees.
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In a 9x13 pan, layer sauce, pasta and cheese.
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Add about 1/3 of sauce to bottom of casserole dish.
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Top with 1/3 of the pasta, followed by 1 1/2 cups of cheese and additional 1/3 of the pasta.
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Add remaining pasta, then sauce, then finish with cheese.
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Cover with foil and bake 30-45 minutes or until sauce is bubbly around the sides and cheese has melted.
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Let stand a few minutes before serving.