Preheat oven to 325 degrees.
Lightly coat an 8x8 baking dish with nonstick spray.
Mix butter, sugar, and graham cracker crumbs together until moistened.
Press crust mixture into bottom of greased baking dish.
Using a mixer, beat quark until smooth.
Add sugar, pumpkin, and vanilla and cream together.
Add eggs one at a time, beating well after each addition.
Pour filling over crust.
Bake 35-40 minutes until edges begin to brown and center no longer wobbles.
Cool completely before refrigerating.
Chill for at least 2 hour before serving.