INGREDIENTS: 1 tsp chile powder 1/2 tsp garlic powder 1/2 tsp onion powder 1/2 tsp ground black pepper 1/2 tsp sea salt, divided 1 lb boneless sirloin steak, about 3/4-inch thick, trimmed of visible fat 2 tsp extra-virgin olive oil, divided 1 medium zucchini, cut into eighths lengthwise, then cut into 2-inch pieces 1 medium yellow squash, cut into eighths...