In a small, microwave safe bowl, combine chocolate chips and butter, Melt for 1 minute. Stir. Heat an additional 15-30 seconds if not completely smooth and melted.

In a separate bowl, combine peanut butter, powdered sugar and milk. Stir until smooth.

Heat a large skillet over medium heat. Divide peanut butter mixture among 4 slices of bread (a little over a tablespoon per slice). Place a tablespoon of chocolate over peanut butter and top each with remaining slice of bread.

Spray the tops of each sandwich with non stick spray. Lay spray side down on hot skillet. Spray the remaining tops of each sandwich.

Heat each sandwich for 2-3 minutes per side or until toasted. Let sandwiches set 1 minute before serving. Work in batches if necessary.