2 eggs, separated
1/2 cup milk
1/3 cup white sugar
1 cup water
Preheat oven to 375 degrees F (190 degrees C).
In a nonporous bowl, combine eggs, milk, sugar and water. Beat until fully incorporated, 3 to 5 minutes.
Pour mixture into 8 glass, prepared baking dish. Spread 10x10 inch of buttered foil on plate; place 8 slices on baking sheet, 4 inches apart. Bake in the preheated oven for 25 to 30 minutes, stirring after 30 minutes.
To serve, twist edges of halves to make two layers: Top with 1 cup of custard mixture, cover with frozen yogurt and slice for 1/4 cup. Run out if toothpick comes out far too soft.