McDonald's is investing $8.5 billion revamp its menu, focusing on protein-rich items and healthier menu components. The move has led to a 6% drop in its shares. Meanwhile, drive-thru menus across the country are being updated, with restaurants adjusting their offerings. The Red Chickz has signed franchise development agreements in Dallas-Fort Worth and Las Vegas, expanding its fast-casual presence. Diners are also highlighting the best mashed potatoes served by various restaurant chains.