Meanwhile, cook ground beef in a skillet over medium heat, breaking it up with a masher or base of a wooden spoon and stir in taco seasoning until just brown.
Optional: combine sour cream and ranch mix.
Fill tacos with ground beef, shredded cheese and fiesta sour cream and any additional toppings.
Substitutions and Variations
Monterey Jack Cheese - Can substitute colby jack or pepperjackTaco Seasoning - Can substitute Old El Paso Taco Seasoning or your favorite.La Tiara Corn Taco Shells - Toast them in the oven for just a minute or two for a thin, crispy, delicious crunch! Truly my very favorite.Sour Cream - Substitute crema
Hidden Valley Fiesta Ranch Dip - Optional, but it really makes these Mexican beef tacos taste like a party!