Flatten bread with a rolling pin. In a small bowl, combine the cream cheese, onions and bacon. Spread mixture over bread slices. Cut asparagus to fit bread; place two spears on each bread slice. Roll up bread and place, seam side down, on a greased baking sheet. Brush with butter; sprinkle with Parmesan cheese.
Bake at 400 degrees for 10-12 minutes or until lightly browned. Serve immediately.