01 -
Heat a large skillet over medium heat. Add ground beef and cook, breaking it apart, until fully browned and no pink remains. Drain excess fat to avoid greasiness.
02 -
Bring a large pot of salted water to a boil. Cook pasta shells according to package directions until al dente. Drain thoroughly to prevent excess moisture.
03 -
Lightly grease a 6-quart slow cooker insert. Add browned ground beef, cooked pasta shells, taco seasoning, evaporated milk, cubed Velveeta cheese, and sliced butter. Stir well to evenly combine all components.
04 -
Cover and cook on low for 2 to 3 hours or on high for 1 to 1.5 hours, stirring occasionally to ensure even melting and prevent sticking. Cook until the cheese is fully melted and sauce is smooth.
05 -
Stir the mixture thoroughly before serving to achieve an evenly creamy texture. Serve hot, garnished with fresh cilantro, sliced green onions, or jalapeños as desired.