01 -
Shred the cheddar and Monterey Jack cheese from blocks and allow to come to room temperature for optimal melting.
02 -
Cook and crumble ground beef over medium-high heat in a high-walled pot or dutch oven until fully browned. Drain excess grease.
03 -
Melt butter in the same pot and add minced garlic. Sauté for 1 minute until fragrant.
04 -
Add taco seasoning, Worcestershire sauce, tomato paste, beef broth, chicken broth, milk, and Rotel tomatoes. Stir thoroughly to combine all ingredients.
05 -
Bring mixture to a gentle boil. Add pasta shells, ensuring they're fully submerged. Cover and cook according to package instructions. Halfway through cooking time, use a silicone spatula to prevent ingredients from sticking to the bottom.
06 -
Remove cover and test pasta for doneness by tasting a shell. If needed, continue cooking covered until pasta reaches desired tenderness.
07 -
Reduce heat to low. Gradually add shredded and cubed cheeses, stirring continuously until completely melted and sauce is smooth.
08 -
Allow pasta to stand briefly as sauce will thicken and pasta will continue to absorb liquid. Serve once desired consistency is reached.