Barbara, first of all, compare your Jordan Marsh muffin recipe to ours: Famous Department Store Blueberry Muffins. If it's the same, I'm not sure why your muffins aren't rising well - as these seem to rise nicely. You could definitely try bringing your ingredients to room temperature, and add a couple of tablespoons of the Cake Enhancer as well, to see if that helps. Good luck - PJH

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