Step 1

Preheat oven to 375°F. On a lightly floured surface, roll dough into 12 by 19-inch rectangle. Cut into 8 rectangles, 4 by 5-1/2 inches each.

Step 2

Combine beef, 1-1/2 cups cheese and onion, if desired, in large bowl; mix well. Divide beef mixture into eighths; press mixture to compact and place lengthwise in center of rectangles. Fold long sides of each rectangle over filling, pressing to seal. Place on ungreased shallow-rimmed baking sheet. Brush with egg white. Sprinkle with remaining 1/2 cup cheese. Cut small slit in top of each pocket to vent.

Step 3

Bake in 375°F oven 13 to 16 minutes or until golden brown. Serve with sour cream. Garnish with chives, if desired.