Whisk eggs with 1 tablespoon cold water; reserve. Sauté peppers and onions in oil until tender; reserve. Cut potatoes in ⅛” slices; distribute among 24 nonstick, 3-ounce muffin cups. Top with reserved pepper mixture; pour in reserved eggs. Bake at 375°F 10 minutes; lower heat to 325°F and continue baking 15 more minutes. Let cool 5 minutes. Remove from tins; serve hot.