Heat oven to 375F degrees. Unroll dough into 4 long rectangles. Place crosswise on an ungreased 15x10x1 inch baking sheet; press over bottom and 1 inch up sides to form crust. Firmly press perforations to seal.

Bake at 375Fdegrees for 14 to 19 minutes, or until golden brown. Cool completely. Spread beans over crust to within 1/2 inch of edges. In a small bowl, combine sour cream and taco seasoning mix; mix well. Spread sour cream mixture over beans. Sprinkle cheese, onions, green pepper, tomatoes and olives evenly over sour cream.

Cover and refrigerate 1 hour. Cut into squares. Serve with salsa if desired.