Preheat oven to 350 degrees. Line 14 cups oftwo 12-cup muffin tins with baking cups,and lightly coat each with cooking spray.
Whisk together flours, sugar, bakingpowder, and 1/2 teaspoon salt in a large bowl. Whisk togetheryogurt, oil, eggs, and egg whites in amedium bowl. Fold yogurt mixture into flour mixture, then gently fold in parsnipand rosemary until combined.
Spoon batter into baking cups untileach is three-quarters full. Sprinkle each muffin witha pinch of coarse salt. Bake until atoothpick inserted into the center of eachcomes out clean, about 25 minutes.Transfer pans to wire racks, and let coolfor 10 minutes. Turn out muffinsonto racks, and let cool completely.