In A Nonstick Skillet, Cook Sausage Over Medium Heat Until No Longer Pink. Remove With A Slotted Spoon To Paper Towels. Discard Drippings. In The Same Pan, Saute Potatoes, Onion And Garlic In Oil Until Potatoes Are Golden Brown, About 5 Minutes. Add Water, Seasonings And Sausage; Cook And Stir Over Medium Heat Until The Water Has Evaporated, About 1 Minute. In A Bowl, Combine The Eggs, Egg Whites, Buttermilk, Flour And Parmesan Cheese. Stir In Sausage Mixture. Fill Muffin Cups Coated With Nonstick Cooking Spray Three-Fourths Full. Bake At 350 Degrees F For 20-25 Minutes Or Until A Knife Comes Out Clean. Carefully Run A Knife Around The Edge Of Cups To Loosen Frittatas. Serve With Salsa.