In mixing bowl, combine yogurt, salt, stevia, coconut flakes and chocolate chips, if using.

Into glass brownie pan lightly sprayed with coconut oil, pour yogurt mixture.

Using spoon, drizzle nut butter over yogurt, making design of choice.

Place in freezer about 45 minutes.

Let sit briefly prior to slicing into squares. Return unused portion to freezer immediately. (Note: Squares will defrost quickly. Add to small ramekins, if desired, and eat with spoon.)