Ardyce Piehl of Wisconsin Dells, Wisconsin relates, "These moist muffins are chock-full of blueberries. I keep frozen berries on hand-it's so convenient to be able to fold them frozen into the muffin batter."
This is my personal rendition on a favorite from Quebec. The addition of pumpkin to ordinary mashed potatoes gives them an nice earthiness that goes well with roasted poultry or other autumnal fare. I have not tried it with canned pumpkin but will experiment eventually. Though I don't cook much with butter, you should feel free to add some more to suit your taste.