Preheat oven to 325 degrees F.
In a stand mixer, mix the eggs, yolks, coconut milk, vanilla extract, and stevia until well combined. Set aside.
In a small saucepan add the Caramel sauce ingredients and stir until combined over medium low heat, until bubbles form around the edges. Simmer one minute, then pour into a 10 inch pie dish, cake pan or 10 individual ramekins. Swirl around to cover bottom of dish. Let sauce cool just 1-2 minutes before pouring the custard mixture over the caramel sauce.
Place the pie dish into a larger roasting pan and place in the oven. Pour 2 cups of hot water on the bottom of the larger roasting pan so the hot water comes 1-2 inches up the sides of the pie dish.
Bake 1 hour or until a knife inserted near the center comes out clean. Cool to room temperature then refrigerate for two hours or overnight. When ready to serve, loosen edges with a knife and invert onto a large plate. Sometimes erythritol can develop crystallization in the refrigerator. If that happens after you invert the flan onto a plate, simply remove can crystallized pieces from the caramel sauce. Enjoy or keep refrigerated until ready to serve.