In a mixing bowl, combine the egg yolk, coconut flour, sweetener, pumpkin pie spice, heavy cream and canned pumpkin.

Place the butter into a small microwave safe bowl and microwave for 30 seconds until melted. Let it cool for a minute or so and then add to the pumpkin mixture and mix well.

Divide the mixture into 4 small dessert dishes. Then take 1 or 2 and microwave for 30 seconds. Check to see if they are done. You want the middle to be a bit moist so it doesn't over cook. If it needs more cooking, just cook for 10 seconds more until done.

You can eat these cold or warm. Top with whipped cream, cinnamon or crushed nuts. Or you can eat them as is. Cover leftovers with plastic wrap and refrigerate.