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McDonald's Corp. is going bigger with all-day breakfast.

In a bid to maintain the hype — and the sales gains —- the chain is planning to add McGriddles and more breakfast sandwiches to its all-hours menu.

The change will take place across the U.S. in September, almost a year after all-day breakfast was first introduced, the Oak Brook, Ill.-based company said Wednesday.

All-day breakfast has been a key piece of Chief Executive Steve Easterbrook's effort to revive the struggling fast-food giant.

The strategy helped McDonald's global same-store sales rise 6.2 percent in the first quarter, the biggest gain in four years. The chain has also boosted sales with value meals, and its bottom line has gotten a lift from lower commodity costs.

Right now, the full-day breakfast menu is limited, with some locations selling only English muffin-based sandwiches and others only selling biscuit ones.

With the expansion, biscuit and McMuffin options will be available at all U.S. locations, along with three varieties of McGriddles — a sandwich that uses maple-flavored pancakes as buns.

McDonald's, which is scheduled to report third-quarter results on July 26, is facing a fiercely competitive domestic industry.

Wendy's Co. has been advertising a four-items-for-$4 deal, while Burger King is introducing new fare, including fried Mac 'n Cheetos sticks and hot dogs.