Gluten-Free Cinnamon Bun Donut

1. Preheat oven to 350 F. Mix together the dry ingredients (almond meal through salt) in a medium mixing bowl.
2. In a separate bowl, mix together wet ingredients (butter through buttermilk).
3. Mix wet ingredients into dry ingredients, stir until combined. Batter will be very thick.
4. Melt the butter for the swirl, cool it a bit, and then mix in the sugar and cinnamon.
5. Pour butter mixture on top of the batter and swirl with a skewer, but only mix it in a little to marble the two mixtures together.
6. Transfer batter to a piping bag with no tip.
7. Pipe into a greased donut tray. I made 6 large donuts, but 7 or 8 would probably be better.
8. Bake at 350 F for 20 minutes or until a skewer inserted in the center comes out without wet batter on it. Remove from oven.
9. Cool.
10. Mix together ingredients for icing. Using a spoon or fork, drizzle icing over donuts on a cooling rack. Serve.