Preheat the oven to 325oF.
Pour 1 tablespoon of maple syrup into the custard cups, swirling the maple syrup around the cup to coat on all sides.
Place the custard cups into a 9x13 casserole dish.
In a mixing bowl, beat the eggs, ricotta cheese, sugar, vanilla extract, and remaining maple syrup until smooth and creamy. Refrain from beating the mixture, or it will become foamy.
Divide the custard mixture between the six custard cups using a large ice cream scoop or small ladle.
If desired, sprinkle each custard cup with ground nutmeg or cinnamon.
Place the casserole dish on the oven rack.
Carefully pour boiling water into the casserole dish until about 1-inch of water fills around the custard cups.
Bake for 40 to 45 minutes or until a knife inserted in the center returns clean.
Remove the custard cups from the water bath and allow them to cool completely before chilling.
Cover the custard cups and refrigerate for at least two hours or overnight before serving.
To serve, run a small sharp knife around each custard and put a serving plate over the custard cup. Invert the plate and custard cup so that the custard releases from the cup and the maple syrup runs down the side of the flan. Serve immediately.