Stir in walnuts, brown sugar, 2 teaspoons cinnamon and ½ teaspoon nutmeg. Mix well -- reserve for later use.
In a bowl mix together flour, baking powder, baking soda, salt, 3 teaspoons cinnamon and ½ teaspoon nutmeg.
Set aside. In a large bowl cream together ¾ cup butter with sugar.
Beat in eggs one at a time.
Add vanilla.
Alternately stir in flour mixture with sour cream and milk.
Blend until smooth.
half of batter into a greased tube pan.
Spread half of nut mixture over batter.
Repeat once more.
Bake until golden and a cake tester inserted into center comes out clean, about 45 minutes. Cool cake in the pan on a wire rack for 10 minutes.
Remove from pan. Cool. Mix powdered sugar with water and drizzle over cake.
Recipe by Amish 365 at https://www.amish365.com/amish-amazon-cinnamon-coffeecake-vintage-cookbooks-natural-deodorant-and-more-plus-a-cinnamon-coffeecake-recipe/