Preheat oven to 375 degrees F. Lightly grease a half sheet baking pan (13"x18"x1") with non-stick spray and set aside.
Combine the ingredients for the crust in a food processor and pulse several times until mixture resembles coarse sand. (see notes if you do not have a food processor). Pour into the baking sheet and press into an even layer. Bake for 15 minutes, remove from oven and set aside.
Combine the ingredients for the filling in a large bowl and whisk together until smooth. Pour over the crust and smooth into an even layer if needed. Bake for an additional 25 to 30 minutes or until the center is set and no longer jiggly. Remove from oven and let cool completely. Cut into squares and top with whip cream if desired. Enjoy!
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Notes
If you do not have a food processor, combine the ingredients for the crust in a large bowl and use a fork to cut in the butter until the mixture resembles coarse sand.*This recipe can be made in a 9"x13" cake pan, but will need a few minutes longer cooking. Check center of cake pan for doneness.