mix all dry ingredients and add chopped butter, mix in and then egg until it forms a "dough". press 1/2 the dough into the bottom and edges of the prepared pan.
In a separate bowl, add pumpkin and cream cheese and mix well, add vanilla and egg and mix until combined.
Pour mixture over the crust and place in the oven for 15 mins.
Combine remaining dough with cinnamon a tsp of flour and mix until crumbly. Reduce oven temp to 350 and sprinkle topping over the pumpkin filling. Bake for 30-40 mins or until toothpick comes out clean. chill for at least 2 hours.