(Reuters) - McDonald's said on Tuesday it would not impose any surcharges when serving eggs as part of its meals and will also launch $1 McMuffins on its app, in a move to attract consumers in the United States.

"Unlike others making news recently, you definitely WON'T see McDonald's USA issuing surcharges on eggs, which are 100% cage-free and sourced in the U.S.," Michael Gonda, McDonald's chief impact officer for North America, wrote in a post on LinkedIn.

The burger giant has been aiming to attract lower-to-middle income consumers who have been shying away from splurging on dining out amid rising inflationary woes.

Americans have been grappling with higher egg prices at retailers including Walmart ( WMT ) owing to increasing cases of bird flu, or avian influenza, which has hit egg production in chickens.

U.S. diner chain Waffle House has added a 50-cent surcharge for every egg in a customer's order, the company had said earlier this month.

McDonald's posted its biggest decline in U.S. sales during its latest earnings report, even as its global sales saw a surprise increase.