Put all ingredients in the blender and process until very smooth.
Spray a 9-inch pie plate with cooking spray. Pour mixture into prepared pan.
Place pan on top rack of the oven and place a flat pan of water on the bottom rack. Bake 30-40 minutes.
Chill well before serving.
Notes
For Sliky Chocolate Cheesecake, do this: Omit all the lemon ingredients, add 4 T. unsweetened cocoa powder, up the stevia to ⅓ c. and if you like, add a teaspoon of almond extract for added depth and richness.
For Peanut Butter Cup Cheesecake, follow the directions for the silky chocolate variation, above, but omit the almond extract. Add 4 T. powdered peanut butter, a la PB2 or Betty Lou's Just Great Stuff.