Step 1

Preheat oven to 375º F.

Step 2

Whisk together mayonnaise, white wine vinegar, pepper, mustard, salt, sugar, garlic, and horseradish.

Step 3

Place chicken in marinade and refrigerate at least 20 minutes, then place in baking dish. Pour remaining marinade over chicken and place baking dish in oven.

Step 4

Bake for 30 minutes, or until juices run clear.

Step 5

Remove from oven and serve with mashed potatoes.