How Jiggly Should Flan Be?

The center should be almost set, but will still be a little bit jiggly. (Do not overcook – otherwise your flan will have “bubbles” on the side and will have a curdled texture to it.)

How should flan look when it's done?

Your flan should be done when it's lightly colored and firm to the touch but not solid. To double check, stick the blade of your knife in the center of the flan and halfway down; the blade should come out clean. Carefully remove the baking pan from the oven, then remove the flan from the water bath.

How do you know if flan is undercooked?

Meaning, by calling it “just set,” the outer edges of the ramekins feel firm when you tap it, but the center is still a bit jiggly (not at all liquid-like feel) while the custard's surface is flat. These signal that it's time for you to finish baking. So, don't make an overcooked flan and remove them from the heat.