Hands-On Time: 12 min., Total Time: 20 min.
Preheat oven to 350°. Place bread slices on a baking sheet. Bake 8 to 10 minutes or until toasted.
Meanwhile, stir together sour cream and next 3 ingredients in a small bowl.
Top each bread slice with chopped roast beef, sour cream mixture, and blue cheese. Sprinkle with freshly ground pepper. Garnish, if desired.
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