Today is National Cookies Day, and McDonald’s Canada is celebrating with this buy one get one free offer! Today only buy one RMHC Cookie and get one free, exclusively on the McDonald’s app. A portion of the proceeds from all RMHC Cookies assists families who are staying at Ronald McDonald Houses and Ronald McDonald Family Rooms across the country.

To get this offer, you will have to download and register for the app if you don’t already have it. The offer is valid December the 4th only, with a limit of one offer per customer, and at participating McDonald’s restaurants in Canada. A single RMHC cookies is 99 cents, and it looks like the current flavour offerings are Festive Ginger, Brownie, and Chocolate Chunk.

Click here to get the McDonald’s app if you don’t have it.