Slow Cooker Steak Fajitas

1 beef flank steak (about 1 lb)
1 medium onion (cut into strips)
½ c medium salsa
2 T fresh lime juice
2 T chopped fresh cilantro
2 cloves garlic, minces
1 T chili powder
1 tsp ground cumin
½ tsp salt
1 sm green bell pepper, cut into strips
1 sm red bell pepper, cut into strips
Flour tortillas, warmed

1- Cut flank steak lengthwise in half, then crosswise into thin strips. Combine beef stips, onion, salsa, lime juice, cilantro, garlic, chili powder, cumin and salt in slow cooker.
2- Cover; cook on LOW 5-6 hours. Add bell peppers. Cover; cook 1 hour.
3- Serve with flour tortillas and additional salsa.