It’s a chicken-and-egg problem: Restaurants are struggling with record-high U.S. egg prices, but their omelets, scrambles and huevos rancheros may be part of the problem. Breakfast is booming at U.S.

Some restaurant chains in recent weeks have announced surcharges on menu items featuring eggs amid an egg shortage caused by the HPAI, more commonly known as bird flu, while other chains have decided ...