Blueberry cinnamon streusel cake

Cream butter and sugar until light and fluffy. Add eggs, one at a time, mixing well between each addition. Mix in vanilla. In a separate bowl, combine flour, baking powder, baking soda, and salt. Add to creamed mixture alternately with sour cream, beating well between additions. Spoon a third of the batter into a greased and floured tube pan. Combine brown sugar, flour, and cinnamon; sprinkle half of the mixture over the batter. Top with half of the berries. Repeat layers, top with remaining batter. Bake at 350° for 55-65 minutes, or until a toothpick inserted comes out clean. Cool for 10 minutes, then remove cake from pan. Combine glaze ingredients and drizzle over warm cake.