he McDonald's comeback just might be legit.

The burger chain just announced a key milestone: U.S. sales are growing for the first time since 2013.

Americans devoured McDonald's (MCD) new premium buttermilk crispy chicken deluxe sandwich and its breakfast menu, especially the revamped Egg McMuffin.

Most impressively, McDonald's returned to domestic growth during the third quarter without any help from all-day breakfast, which didn't launch until early October.

After years of losing customers to trendy rivals like Chipotle (CMG) and Shake Shack (SHAK), McDonald's is trying to reinvent itself. In addition to all-day breakfast, McDonald's CEO Steve Easterbrook has sought to improve food quality with a number of changes, including promisingcage-free birds within a decade.

Related: Chipotle has worst sales growth in over 2 years

"While still in the early stages, we believe our turnaround plan is starting to generate the change needed to reposition McDonald's as a modern, progressive burger company," Easterbrook said in a statement.

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