Pre-heat oven to 375 degrees. Grease 9 inch round pan.
In a medium bowl, mix together streusel ingredients until crumbly. Set aside.
In a large bowl, mix Bisquick, sugar, milk and egg until well blended.
Add three shakes of cinnamon and 1 tsp vanilla to batter. Mix together until well blended.
Pour coffee cake batter into greased pan.
Sprinkle top of batter with the cinnamon streusel.
Bake 18-20 minutes or until golden brown.