Heat oil in a 12 inch skillet over medium heat. Saute onion in skillet until soft and
translucent.
Add ground beef and cook until the meat is no longer pink.
Drain any excess fat.
Add chili seasoning and stir to distribute.
Add Rotel tomatoes (including juice), tomato paste, and water. Bring the mixture to a boil.
Add the macaroni noodles, continuing to heat until everything is boiling. Reduce heat to a simmer and cover with a lid. Cook for 10 minutes until pasta is cooked all the way through.
Remove from heat. Stir in ½ cup of the cheese to distribute evenly.
Spread the remaining cheese over the top and place the lid back onto the pan and let set for 2-3 minutes until the cheese has all melted.
Serve.
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Notes
While the Rotel tomatoes do add a lovely bit of spice to the dish, you can also make use of diced canned tomatoes instead if you wish.
Make sure to drain excess fat once cooking the ground beef otherwise you could end up with a greasy dish owing to the naturally high fat content found in beef. You could also use 90% lean ground beef which will drastically reduce the amount of grease while still offering great flavor.
Whatever cheese you opt for, stick to grating your cheese at home instead of buying pre-shredded cheese. Store bought shredded cheese usually has an anti-caking coating that prevents the cheese from melting smoothly.