Preheat oven to 450°.
Arrange bread on a jelly-roll pan. Bake at 450° for 5 minutes or until golden.
Stir together sour cream, mayonnaise, and horseradish; spread evenly on toasted bread. Top with roast beef, cheese, lettuce, and tomato. Top with remaining bread slices. Cut in half diagonally.
Oxmoor House Healthy Eating Collection
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