Preheat oven to 375°. In a small bowl, mix cream cheese, onion and milk until blended. On a lightly floured surface, unroll crescent dough into one long rectangle; press perforations to seal., Spread with cream cheese mixture; sprinkle with bacon. Roll up jelly-roll style, starting with a long side; pinch seam to seal. Using a serrated knife, cut roll crosswise into twenty-four (1/2-inch) slices. Place on ungreased baking sheets, cut side down., Bake 12-15 minutes or until golden brown. Refrigerate leftovers.