Prepare chocolate streusel; set aside. Cream butter and sugar in large mixer bowl until light and fluffy. Add eggs; blend well on low speed. Stir in vanilla and sour cream. Combine flour, baking powder, baking soda and salt; add to batter. Blend well. Sprinkle 1 cup of the chocolate streusel into greased and floured 12 cup Bundt pan. Spread a third of the batter (about 1 1/3 cups) in pan, sprinkle with half of remaining streusel (about 1 cup). Repeat layers, ending with batter on top. Bake at 350 degrees for 50 to 55 minutes or until cake tester comes out clean. Cool 10 minutes; invert onto serving plate. Cool completely.
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Chocolate Streusel- Combine 3/4 cup packed brown sugar, 1/4 cup flour and 1/4 cup butter or margarine, softened in medium mixing bowl until crumbly. Stir in 3/4 cup chopped nuts, and 3/4 cup semi sweet chocolate mini chips.
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