I can't think of anywhere in the parks where you can buy just a Mickey waffle. Sunshine Seasons at Epcot used to have them, I believe, but they are not currently serving breakfast
Inside the parks? I'm not sure. But I have had them at several resort food courts or counter service restaurants (off the top of my head: POR, WL, and All-Star resorts).
Captain Cooks at the Poly and Gasparilla Grill at the GF both have a kids Mickey waffle option and a regular menu waffle option. There're not in the MK but they are a short monorail or boat ride away.
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