Here’s when you can expect the nostalgic treat to hit shelves. ' title='3 peanut butter & jelly m&m packages on background with blue border'> M&M's | Design: Better Homes & Gardens When comfort food is on the menu, few meals are as reliable and soothing as a classic peanut butter and jelly sandwich. The simple, smooth peanut butter (or crunchy, if that’s your, well, jam)...