Preheat the oven to 350°F. Line an 8" x 8" or 9'' x 9'' square pan with parchment paper or aluminum foil and grease with butter or non-stick cooking spray. Set aside
Crumble graham crackers in food processor until fine and crumbly. Stir together the crumbs, sugar, salt, cinnamon, and melted butter.Press into the bottom of an 8" x 8" square pan.Bake the crust for 8 to 10 minutes, until set a little golden. Remove the crust from the oven and cool for a few minutes until slightly cool.
For the filling:
Beat together the white sugar, and cream cheese by hand, in food processor or with electric mixer for 2 minutes until smooth; Stir in the egg, milk, and vanilla and mix well then spread filling mixture over baked crust.Bake for 25 to 30 minutes at 350°F; let cool for at least 15 minutes before cutting. For easier cutting use floss.