Heat your oven to 375°F.
Add 1 1/2 cups shredded mozzarella and 2 ounces cream cheese to a microwave-safe bowl.
Melt the cheeses in the microwave for a total of 90 seconds in 30-second intervals, stirring between each interval.
To the same bowl, add 1 egg, the almond flour, and the baking powder.
Knead all the ingredients together with your hands until fully incorporated then create a large dough ball.
Divide the dough ball into 3 equal parts.
Roll out each of the 3 dough parts into individual 8-inch circles in between two layers of parchment paper.
Remove the top layer of parchment paper and carefully transfer the bottom layer of parchment paper with the 3 dough circles on it to a baking sheet.
Mix your fillings (the cheeses & cooked Italian sausage) together in a medium bowl.
Put 1/3 of the filling on one half of each dough circle.
Fold the other half of the dough over and seal the edges with a fork.
Beat the remaining egg with a fork lightly and brush the egg over the top of each calzone.
Using a knife, make 3-4 slits in the top of each calzone about an inch apart.
Sprinkle the calzones with dried oregano and coarse salt.
Bake for 20-26 minutes or until tops are golden brown.