Preheat your oven to 325°F (165°C).
Coat the bottom of a 6-inch round glass baking dish or ceramic ramekin with the monk fruit maple-style syrup, ensuring the base is evenly covered.
In a high-speed blender, combine the eggs, egg whites, Greek yogurt, almond milk, granulated monk fruit, vanilla extract, sea salt, and ground cinnamon.
Process the mixture on a low speed for about 30 seconds until it is completely smooth and no lumps remain.
Carefully pour the custard mixture into the prepared baking dish over the syrup layer.
Place the baking dish inside a larger roasting pan and fill the roasting pan with hot water until it reaches halfway up the sides of the custard dish to create a water bath.
Bake for 45 to 50 minutes until the edges are set and firm, but the center still has a slight, jelly-like jiggle.
Remove the dish from the water bath and allow it to cool to room temperature on a wire rack.
Cover and refrigerate for at least 4 hours, or overnight, to allow the flan to set completely.
To serve, run a thin knife around the inner edge of the dish and carefully invert the flan onto a rimmed plate so the syrup flows over the top.