Combine the olive oil, lime juice, cilantro, mustard and fajita seasonings for the steak marinade. Pour the marinade over the steak reserving 1 tablespoon for drizzling at the end. Heat a large 12″ skillet over medium high heat and cook the onions until soft and fragrant, then add the bell peppers.
It’s a blend of chili powder, cumin, smoked paprika, onion powder, garlic powder, salt and black pepper. Or if you already have a favorite brand of fajita seasoning, you can certainly use that instead. Combine the olive oil, lime juice, cilantro, mustard and fajita seasonings for the steak marinade.
Now for the veggies, which are an important part of fajitas: slice up a couple of onions… A red bell pepper… An orange bell pepper… A yeller bell pepper… And a green bell pepper. I love all the colors. But you can just pick one or two.