Healthy Steak Fajitas are excessively easy and won't take more than 20 minutes of your time. We eat with our eyes and this recipe has just as much color as it does flavor, so go ahead and dig in.
In a medium bowl, combine lime juice, paprika, and cumin. Add red and yellow bell peppers, onion, tomato, and mix well.
Heat olive oil over medium-high heat. Add bell pepper mixture and cook 7-10 minutes, stirring occasionally, until peppers are soft. Remove from pan.
Add flank steak to the hot pan and stir-fry 2-3 minutes or until desired doneness. Lay out tortillas. Divide spinach evenly among each tortilla, top with cooked vegetables and steak strips.
Top each fajita with 1 tablespoon cheese and 1/2 tablespoon sour cream before serving.