Heat oven to 375 deg f. Mix dressing, flour, bouillon and pepper in a small saucepan. Gradually add milk. Cook, stirring frequently, over medium low heat until thickened. Add vegetables and poultry. Cook, stirring, until thoroughly heated. Spoon into 8" square pan. Unroll cresent rolls and press perforations together to seal. Place rectangles side by side to form a square. Press edges together to form a seam. Cut dough into 1" strips. Arrange in lattice over casserole. Bake for 15 to 20 minutes or until golden brown. Makes 6 servings.