1/4 cup butter, softened
1 cup sugar
1 egg
1 cup all-purpose flour
1 teaspoon baking soda
1/4 teaspoon salt
1/4 teaspoon ground nutmeg
1/4 teaspoon ground cinnamon
2 cups grated peeled tart apples
1/4 cup chopped walnuts
1 teaspoon vanilla extract
4 cups vanilla frozen yogurt