Caramelize half cup sugar in nonstick skillet, stirring constantly. When melted, pour into the bottom of a Pyrex dish.
Beat 6 eggs, or mix in blender. Add milk, vanilla and 1 cup sugar. Beat thoroughly; pour into dish on top of caramelized sugar.
Place Pyrex dish in a larger dish. Add water to the larger dish to half cover the contents of the Pyrex dish. (“Bano Maria”)
Bake 45 minutes to 1 hour, until flan is set, light brown and firm. Refrigerate.