Easy Steak Fajita Salad

Name: Easy Steak Fajita Salad
Ingredients: 1 tbsp. olive oil; 2 tsp. lime juice; 1 tsp. pepper; 1 tsp. salt; 1 tsp. chili powder; 1 tsp. cumin; 1 medium red bell pepper, sliced; 1 medium yellow bell pepper, sliced; 1 small red onion, sliced; 1 lb organic, grass fed flank steak, thinly sliced; 1/2 c pepper jack cheese, shredded; 1 tomato, sliced; 8 c spinach leaves; 1/2 c pineapple salsa (or other favorite salsa); 1 avocado, pitted and sliced (optional)