• Prepare a large sheet of aluminum foil by spraying it lightly with cooking oil on one side.
• In a small bowl, combine chili powder, cumin, paprika, 1 teaspoon salt and 1/2 teaspoon pepper. Set aside.
• Preheat grill to medium high heat.
• Beginning with 2 teaspoons of the Canola oil, add the onions and garlic to cast iron skillet over grill. Sprinkle with 1 teaspoon of the chili cumin mixture. Cook, moving often, over medium-high heat allowing skins to char, about 2-3 minutes. Move the peppers to one side of the skillet.
• Add the peppers. Sprinkle with 1 teaspoon of the chili cumin mixture. Cook, moving often, over medium-high heat allowing peppers to char, about 2-3 minutes. Remove skillet from heat and transfer vegetables to prepared foil and set on cool side of the grill. Do not wrap.
• Reduce grill heat to medium. Add the remaining Canola oil to the skillet. Working in batches, peel single sheets of the raw beef from the packaging and add as flat layers into the skillet. Sprinkle with 1 teaspoon of the chili cumin mixture. As the first layer cooks, and there is barely any pink remaining, flip the layer and move it to the sides of the pan. Repeat with additional sheets of beef and the chili cumin mixture until there is none.
• At this time, move the foil back over to the hot side of the grill and briefly heat the vegetables so they are hot.

if using fajita skillets to serve in, transfer the meat and the vegetables now, otherwise...

• ...move the meat to one corner of the skillet used to prepare everything, and using tongs, transfer the peppers to another corner, and then the onions to another. Cut heat.
• Sprinkle fresh torn cilantro leaves and crumbled Cotija cheese over the fajita mixture. Squeeze several lime wedges over all. Serve the fajitas hot with the remaining lime wedges, sliced avocado, sour cream, chopped tomatoes, and warmed tortillas.

Fried Tortillas

• If wrapping your fajitas in tortillas does not excite you, try cutting several tortillas into quarters and frying in hot oil on the stove top 2 minutes per side. Remove to paper toweling, sprinkle with flakey sea salt, and serve at room temperature with fajitas as a crispy tortilla "chip." Watch out because these are addictive!