Chocolate Frozen Yogurt

1/2 cup sugar
1 tablespoon corn starch
1 1/2 cups skim milk
1 egg, lightly beaten
1/2 cup chocolate syrup
1/4 cup light corn syrup
1 1/2 cups plain or vanilla flavored low-fat yogurt
1/2 teaspoon vanilla extract

Combine sugar and cornstarch in saucepan; gradually stir in milk and egg. Bring to a boil, whisking constantly. Cook, stirring constantly, 1 minute, or until thickened and mixture coats a metal spoon. Remove from heat; stir in syrups.

Pour into a bowl; let cool completely. Stir in yogurt and vanilla. Cover and chill 8 hours. Pour mixture into a freezer can of a 1 to 2 quart ice cream freezer. Freeze according to manufacturer's instructions. Allow ice cream to ripen 1 hour in freezer can. Makes 6 to 8 servings.
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