You are the winner of the M&M's Dark Chocolate Mint courtesy of site sponsors @AmericanSoda.
Jane correctly identified the cross-section photo as the Peeps Milk Chocolate!! ... and not the Nestle Butterfinger as answered by the overwhelming majority of entrants!!
If you haven't won this time around please don't despair! The 10.0kg delivery of Ritter Sport chocolates recently will only mean there are plenty of competitions to come!