Preheat oven to 350º F. Butter an 8-cup bundt pan or tube pan, using melted butter and a brush. In a mixing bowl cream butter and sugar. Beat in eggs one at a time. Add yogurt and nutmeg and beat until smooth. Fork-sift dry ingredients and add to yogurt mixture, combining thoroughly but not beating. Stir in apples and nuts. Spoon batter into prepared pan and bake 50 minutes or until done. Cool in pan for 10 minutes and unmold. Dust with confectioners’ sugar or frost with Cream Cheese Frosting.