1 lb. thinly sliced sirloin steak, pounded thin, cut into 1″x3″ strips 2 Tbsp avocado or olive oil, divided 3 bell peppers (different colors), cut into thin strips 1 large yellow onion, sliced into strips 2-3 green onions, green parts sliced Fresh parsley or cilantro, chopped For the fajita seasoning: