Instructions: Preheat oven to 350 degrees. In a medium sauce pan, melt margarine over medium heat. Stir in flour and cook, stirring, for 1 minute without burning. Whisk in milk, bring to a boil, and cook, stirring, until sauce is thick and smooth, about 3 minutes. Stir in the horseradish, yogurt, sugar, mustard, and vinegar. Season with salt and pepper to taste.

Arrange chicken, skinless side up, in a 13x9x2 inch baking dish.

Spoon half of horseradish sauce over chicken. Bake for 45-60 minutes, until chicken is tender. Reheat remaining sauce and spoon/serve over chicken.

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