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In 4-quart Dutch oven, cook beef over medium-high heat 5 to 7 minutes, stirring occasionally, until beef is thoroughly cooked. Halfway through cooking, add onion and green pepper.
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Drain excess liquid.
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Stir in hot water, contents of sauce mix pouch (from Hamburger Helper ® box) and tomatoes.
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Heat to boiling, stirring constantly.
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Reduce heat; cover and simmer 10 minutes, stirring occasionally.
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Stir in contents of uncooked pasta pouch (from Hamburger Helper ® box).
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Cover; cook 10 minutes longer.
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Sprinkle each serving with shredded mozzarella cheese.