Step #1 Trim fat off steak; sprinkle with half each of the chili powder & salt.
Step #2 Broil steak, turning once, until browned but still pink inside, about 6 mins.
Step #3 Transfer to cutting board & tent with foil wrap; let this stand for 10 mins before slicing thinly across the grain.
Step #4 Meanwhile, brush the vegetable oil over nonstick skillet over med-heat/flame.
Step #5 Cook red & green peppers, sliced onion, minced garlic & remaining chili powder & salt stirring every once in awhile, until tender-crisp, about 4 mins.
Step #6 Stir in salsa & lime juice.
Step #7 Mound vegetables, steak & sour cream in each lettuce leaves; roll up.
Enjoy the Lettuce-Wrapped Beef & Pepper Fajitas recipe