The recipe is from Pioneer Woman's Cookbook. There's no marmalade in the muffins, despite the name. You zest oranges into the batter, and brown sugar and orange juice makes a syrupy glaze. I lessened the amount of brown sugar in the glaze, and I didn't miss a sweet drop. The muffins come together quickly and are very tasty, moist muffins. They don't taste as good a couple of days after, as they get a little soggy. To avoid this, eat quickly!