Preheat the oven to 350°F.
Add all ingredients to a blender and blend until completely smooth.
Pour into a lightly greased 9-inch pie dish or an 8-inch square baking dish.
Bake for 45–55 minutes, until the edges are set and the center has a slight wobble.
Cool completely, then refrigerate for at least 4 hours—overnight is even better!
Slice and top with Greek yogurt or clean whipped topping and a sprinkle of cinnamon.
