Lemon poppy seed muffins are a classic. They are a welcome addition to any brunch, bake sale, or yummy for a sweet treat for yourself or your friends. With a few simple swaps from a more traditional recipe, this recipe lowers the fat and boosts the nutritional value of the muffins. Enjoy the muffins as is, or up the citrus kick by topping them with a lemon glaze or eating them with lemon curd. Boost the nutritional value of muffins by substituting some of the white flour with whole wheat flour and using a neutral-tasting oil instead of butter. This way, you add a little fiber and reduce the amount of saturated fat and cholesterol in your muffins. You could use fat-free yogurt as listed in the recipe or swap in fat-free or low-fat greek yogurt. It has even more protein than regular yogurt. If you're vegan, there is also a vegan version of these muffins.