Walnut Kifle

Ingredients

• 1/2 cup sour cream
• 1 tablespoon water
• 1 (2-1/4 tsp.) envelope Fleischmann's ® Active Dry Yeast
• 1/2 cup butter OR margarine, softened
• 2 to 2-1/4 cups all-purpose flour
• 2 egg yolks (reserve egg whites for Nut Filling)
• Nut Filling
• 2 egg whites
• 1 cup finely chopped walnuts
• 1/2 cup sugar
• 1 teaspoon pure vanilla extract
• 2 to 3 tablespoons melted butter OR margarine
• Powdered sugar (optional)