Heat oven to 325°F. Spread sugar evenly over bottom of heavy skillet. Cook over medium heat, stirring constantly, until sugar melts and turns light caramel color. Add 3 tablespoons boiling water, stirring until sugar is dissolved. Pour into ungreased quiche dish or 10-inch glass deep-dish pie pan or 8-inch (2-quart) square baking dish . Tilt to evenly cover bottom; set aside.
In medium bowl, beat remaining ingredients with electric mixer on medium speed 1 to 2 minutes or until thoroughly blended. Pour over caramelized sugar. Place baking dish in large pan (broiler pan). Pour 1 inch hot water into broiler pan.
Bake 40 to 45 minutes or until mixture is almost set and knife inserted in center comes out clean. Cool 1 hour; refrigerate 1 hour. Run knife around outside edge to loosen; turn upside down onto 12-inch round serving plate with raised sides to hold liquid. Garnish with spun sugar.