Mix ingredients marinade in a small bowl. Place top sirloin steaks in a baking dish and coat both sides with the marinade. Marinate at room temperature for about 30 minutes.
Preheat large cast-iron skillet on medium-high heat. Add olive oil. Once oil is hot, add peppers, garlic and onions, sauté for 10-12 minutes, or until tender. Add remaining ingredients to skillet and cook until chickpeas are crisp, remove from skillet.
Bring the skillet to high heat (it may begin to smoke). Remove the top sirloin steaks from the marinade and pat dry. Season with kosher salt and freshly ground black pepper and place in skillet. Sear for about 3-5 minutes on each side, or until meat thermometer inserted into thickest part of steak reads 125°F.
Remove top sirloin steaks from skillet and rest for 5-10 minutes. Serve with peppers and chickpeas. Enjoy!