A month after McDonald’s officially beefed up its Quarter Pounder, the fast food giant is poised to make over a few other staples: the English muffin, bagel and biscuit, adding real butter to the ingredient list.

CNBC, citing two sources close to the matter, reports that the switch to the upgraded breakfast items would occur once locations use up their supply of liquid margarine.

While the Golden Arches hasn’t officially confirmed its plans to change the bread items, some stores have already started posting signs about the switch.

A location in Manhattan reads: “We’re proud to cook breakfast items on the grill with real butter and we toast our English Muffins, biscuits and bagels with real butter, too.”

One of the sources tells CNBC that the signs are meant to both highlight the use of real dairy products and warn customers who may have dairy allergies not to consume them.

McDonald’s has been on a roll lately, making changes to its menu. In addition to changing its breakfast breads and beefing up its Quarter Pounder, the fast food giant announced earlier this year it would toast buns and make changes to the way it sears its beef.

The menu revamp is part of the company’s turnaround effort under new CEO Steve Easterbrook.

McDonald’s Continues Menu Tweaks: This Time It’s the McMuffin [CNBC]

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