Preheat oven to 350 F.
Blend the sweetener and cinnamon together in a small dish.
Drizzle the melted butter over sweetener and cinnamon.
Split the round of Brie in half horizontally and temporarily set aside the top half.
Place half of the fruits and nuts on top of the bottom half of Brie and pour half of the sweet cinnamon butter mixture over it.
Place top half of Brie round on top of that, and top it with the remaining fruits, nuts, and sweet cinnamon butter.
Bake for 9 to 12 minutes. Use your nose and your eyes! Always trust them more than the clock.
Remove from oven when cheese is soft and begins to bubble, let it rest for 5-10 minutes before serving.
Serve with slices of fruit, more nuts, bread, crackers - any or all of these.