Combine the graham cracker crumbs, melted butter, sugar and cinnamon in a small bowl. Press into a lightly buttered 9-inch pie pan. Bake for 7 minutes. Let cool for about 15 minutes.
While the crust is cooling, make the filling by combining the cream cheese, granulated sugar, and vanilla, mix on medium speed until smooth. Add eggs and mix until just incorporated.
Pour the filling into the cooled crust and bake until set, 25 to 30 minutes (should almost be set, the very centre will still �jiggle� slightly). Cool 5 minutes before topping; leave the oven on.
Combine the sour cream, granulated sugar and vanilla in a small bowl and mix until smooth. Spread onto the pie and bake for 10 more minutes.
Cool to room temperature, then refrigerate until cold, about 4 hours. Slice and serve.
Notes
Make sure your cream cheese is at room temperature, it mixes up so much smoother and easier if it is.