In a large mixing bowl, cream butter and shortening. Gradually add 2 cups sugar, beat until fluffy. Add eggs 1 at a time, beating well after each one. Combine milk and vanilla and set aside. Sift together flour, baking powder and salt. Add to the creamed mixture, beating just enough to keep batter smooth. Combine cinnamon and remaining sugar, sprinkle 1 1/2 tsp into greased 10 inch tube pan. Pour a third of the batter into pan. Sprinkle with 1/2 of the remaining cinnamon sugar, top with 1/3 of the batter. Repeat layers. Smooth with spatula. Bake at 350 degrees for 1 hr 15 min. Cool for 10 min. Remove from par to a wire rack to cool completely. Dust with confectioners for added sweetness if desired.
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