Season skirt steak with olive oil, salt, pepper, chili powder & cumin. Slice all vegetables. Cook skirt steak on high heat, 3 minutes on each side. Let the steak rest for 10 minutes. While the steak is resting, over medium heat sautee onion & garlic until almost translucent. Add bell pepper, jalepeno, salt & pepper, cook slightly. Cut steak into strips.