In a large skillet, brown and crumble the ground sirloin with the chopped onion until no longer pink.

Drain excess fat from the skillet.

Return cooked beef and onions to the skillet.

Add tomato sauce, water, diced tomatoes, dry macaroni, and seasonings (salt, pepper, cumin, cayenne pepper, garlic powder, dried cilantro).

Stir well to combine all ingredients.

Bring the mixture to a boil.

Reduce heat to medium-low.

Cover the skillet tightly.

Simmer for 12-15 minutes, stirring occasionally, until macaroni is tender.

Add milk and cheese to the skillet.

Stir well until the cheese is smooth and melted.

Serve immediately.