Bird flu is causing egg prices to soar, costing restaurants more, especially those that focus on brunch. Some restaurant owners say they are already raising prices.

Breakfast sandwiches are the most popular order during morning visits, and 70% of the breakfast sandwiches on U.S. menus include eggs. It’s a chicken-and-egg problem: Restaurants are struggling ...

Since bird flu, the price has kept doubling, starting from about $50 to now about $110 a case. “Eggs go into all of our dishes,” he said of his restaurant that only opens for breakfast and lunch.