How to Cook Beef Fajitas

Ingredients

• 1 lb. flank steak
• 1 red bell pepper
• 1 green bell pepper
• 1 onion
• 1 tbsp. vegetable oil
• 1 tsp. chili powder
• 1 tsp. cumin
• 1/2 tsp. garlic powder
• Salt and pepper to taste
• Flour tortillas
• Optional toppings: sour cream, guacamole, salsa, shredded cheese