Found this one, about a year ago, on the internet.
Delicious even if not the one for which you are looking.
Hot Chocolate Pudding Cake
1/4 cup plus 1 tablespoon water
3 squares (3 ounces) bittersweet chocolate (or 1/2 cup semisweet chocolate chips)
1 tablespoon butter
1 cup sugar
1/4 cup all-purpose flour
1/8 teaspoon salt
2 teaspoons vanilla extract
3 large eggs, separated
1/2 cup milk
Whipped cream or vanilla ice cream
1. In small saucepan combine water, chocolate, and butter over medium heat. Heat just until chocolate is melted, stirring frequently. Cool.
2. In large mixer bowl combine sugar, flour, salt, vanilla, egg yolks, and milk. Beat until well mixed. Beat in cooled chocolate mixture. (Can be done up to 1 1/2 hours ahead of time.)
3. Heat oven to 325 degrees F. Grease 1-quart casserole or soufflé dish. In clean, dry mixer bowl with clean, dry beaters, whip egg whites to stiff moist peaks. Fold whites into chocolate mixture and pour into prepared casserole. Place casserole in a larger pan in oven. Pour boiling water into large pan halfway up casserole. Bake 45 minutes, or until firm on top. Serve warm or cold.
Each serving: About 310 calories, 6 g protein, 48 g carbohydrate, 12 g total fat (6 g saturated), 120 mg cholesterol, 115 mg sodium.