1 c. chopped nuts
2/3 c. packed brown sugar
2 tbsp. butter, melted
1 1/2 tsp. ground cinnamon
1 (27 1/4 oz.) pkg. cinnamon streusel cake mix
1/2 c. sour cream

FOR TOPPING: In a mixing bowl stir together pecans, brown sugar, butter and cinnamon; set aside.

Prepare the cake mix batter according to the package directions except stir the sour cream into the prepared batter. Spread 2/3 (about 4 cups) of the batter into a greased and floured 13"x9"x2" baking pan. Sprinkle batter with the streusel mix from the package. Carefully spread with the remaining batter. Sprinkle with reserved nut topping. Bake in oven at 350 degrees for 35 to 40 minutes or until a toothpick inserted near the center comes out clean. Cool slightly in pan. Meanwhile, prepare glaze from the cake mix according to package directions. Drizzle glaze over warm coffee cake.