Easy cheesecake

Found this recipe from the internet & have tried baking, is quite easy & delicious too!

Ingredients
15 graham crackers, crushed
2 tablespoons butter, melted
4 (8 ounce) packages cream cheese
1& 1/2 cups white sugar
3/4 cup milk
4 eggs
1 cup sour cream
1 tablespoon vanilla extract
1/4 cup all-purpose flour

Directions
Preheat oven to 350 degrees F (175 degrees C). Grease a 9 inch springform pan.
In a medium bowl, mix graham cracker crumbs with melted butter. Press onto bottom of springform pan.
In a large bowl, mix cream cheese with sugar until smooth. Blend in milk, and then mix in the eggs one at a time, mixing just enough to incorporate. Mix in sour cream, vanilla and flour until smooth. Pour filling into prepared crust.
Bake in preheated oven for 1 hour. Turn the oven off, and let cake cool in oven with the door closed for 5 to 6 hours; this prevents cracking. Chill in refrigerator until serving.