Unroll crescent roll dough and seperate into 4 rectangles. Press performations to seal. Mix together cream cheese, crumbled bacon, minced onions and milk (may need to add more milk so mixture will spread easily.) SPread on rectangles. Roll up, jelly roll style, starting at long side. Press edges to seal. Cut each roll into 8 slices. Place on ungreased baking sheet. SPrinkle swirls evenly with Parmesean cheese. Bake at 375 for 12 to 15 minutes, or until brown.