Dallas — MOOYAH Burgers, Fries & Shakes, the “better burger” fast-casual franchise, has hired key executives — including president and COO — that will enhance franchisee support and prepare for rapid franchise development. The company has added a new president and COO, Tony Darden, who comes to MOOYAH after serving as COO at Taco Bueno. Prior to Taco Bueno, Darden spent more than a decade at Panera Bread and more than 15 years at Bennigan’s. MOOYAH also added a new director of supply chain, a real estate and development manager, …