Breakfast chain cites supply shortages and surging prices in its tacking on of temporary extra fee for meals with eggs.

Surging egg prices and shortages in the U.S. have created a big opportunity for vegan substitutes made with ingredients such as mung beans.

The soaring price of eggs has forced Waffle House to add a temporary surcharge on customers’ orders.The Georgia-based chain is adding a 50-cent charge per egg because of the “nationwide rise ...