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Upgrade that classic boxed dinner with this homemade macaroni and beef skillet that's fresher, better, and every bit as cozy and comforting.
Gather all ingredients.
Heat a large cast-iron skillet over medium-high. Crumble beef into pan and sprinkle onions into pan. Cook until beef is browned and cooked through, stirring frequently to crumble, 6 to 8 minutes. Stir in tomato paste; cook until tomato paste darkens, stirring constantly, 1 to 2 minutes. Stir in beef stock, salt, Italian seasoning, garlic power, smoked paprika, and pepper. Bring to a boil. Stir in macaroni. Reduce heat to medium or level needed to maintain a low boil; cook, uncovered, until macaroni is tender, stirring occasionally, 12 to 14 minutes.
Reduce heat to low. Stir in half of cheese, then add frozen spinach. Cook until spinach thaws and wilts, stirring occasionally, about 2 minutes. Add remaining cheese, stirring until cheese melts.