Cream butter, 3/4 cup sugar and vanilla; add 3 eggs beating well. Combine flour, baking powder and soda. Add to butter mixture alternating with sour cream. Combine pumpkin, 1 egg, 1/3 cup sugar, and spice. Spoon 1/2 of batter in 9 x 13 pan. Sprinkle 1/2 of streusel over batter. Spread pumpkin mix over streusel. spread remaining batter over pumpkin. Sprinkle remaining streusel on top. Bake at 325 degrees for 50-60 minutes until toothpick inserted in center comes out clean.
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