Preheat oven to 300 F. Carefully separate the the eggs. In one bowl, mix together the egg yolks, the cream cheese and 1 tbsp of the sweetener, until smooth.
In another bowl, add the cream of tartar to the egg whites, then beat on high speed until stiff peaks form. this will take several minutes and will look very thick and not frothy. Then, carefully fold the egg yolk mixture into the egg whites. Try not to break down the fluffiness of the egg whites.
Grease two baking sheets, then scoop the mixture into 20 small rounds. Mix the remaining sweetener with the cinnamon, then sprinkle it onto each of the clouds. Bake for 20 - 30 minutes. Watching closely, as they burn easily. Let cool completely
For the Filling
In a large bowl, beat the cream cheese with the Sweetener, until smooth. Slowly beat in the vanilla, cinnamon and heavy cream. Continue to beat the mixture until stiff. Place in the fridge until the snickerdoodles cool.
Once the snickerdoodles have cooled completely, transfer the filling to a zip lock bag. Flip half of them upside down. Then snip the corner of the ziplock, squeeze the filling evenly onto each of them. (use a spoon if you don't have any ziplocks) Then cover with the remaining cookies.
Note: Store in an air tight container in the refrigerator.
Recipe by Officially Gluten Free at https://www.officiallyglutenfree.com/keto-snickerdoodle-woopie-pies/