Dennysis the latest restaurant chain to add a temporary egg surcharge due to the rising cost of eggs caused by a nationwide shortage and the current bird flu outbreak.Last month, Waffle House added an upcharge of 50 cents per egg. Meanwhile, many supermarket chains, including Trader Joes, Market Basket, and big-box retailers including Walmart, Costco, and Sams Club, have raised prices and limited the number of cartons shoppers can buy.This pricing decision is market-by-market, and restaurant-by-restaurant due to the regional impacts of the egg shortage, Dennys told Fast Company in astatement. We will continue to look for ways to provide options on our menu, including our $2 $4 $6 $8 Value Menu.The restaurant said it would not specify which of its 1,500 locations would see the surcharge as the situation is fluid.Once an inexpensive food staple, eggs have soared in price in recent months. As of last week, a dozen white eggs was $8.07, according to CNBC. Bird flu, or avian influenza, has had a crippling effect on the nations egg supply, resulting in the death of 18.9 million birds in just the past 30 days, according to the U.S. Department of Agriculture (USDA).This is a double whammy for Dennys, which announced more store closings earlier this month as part of the restaurant chainsplan to jumpstart its waning growth. Like many fast-food and casual-dining chains, it has been struggling in recent years due to inflation, changing customer habits, and skyrocketing food prices.We have taken a close look at every restaurant in our domestic portfolio; and as a result, at the end of last year, we announced the decision to close approximately 150 restaurants by the end of 2025, Dennys previously told Fast Company. We began the closing process last year, and we are continuing to work through our plan. More than half of these locations have already closed.Dennys said the closures will enable its franchises to open upwards of 20 new locations in 2025 . . . and remodel some current locations.