Heat oven to 375°F.
If using crescent rolls: Unroll dough; separate into 4 rectangles. Firmly press perforations to seal. If using dough sheets: Unroll dough; cut into 4 rectangles.
In small bowl, mix cream cheese, onion and milk; beat until well blended. Spread about 2 tablespoons cream cheese mixture evenly over each rectangle. Sprinkle each with bacon. Roll up, starting at longest side; pinch edges to seal. Cut each roll into 8 slices. Place on ungreased cookie sheet. Sprinkle with cheese.
Bake 12 to 15 minutes or until golden brown. Serve warm. Store in refrigerator.