In a small bowl, combine the peanut butter and miso paste, make sure both are at room temperature so that they combine easier.
Once they are combined, taste and adjust as needed to your desired miso level.
Lay out a slice of bread on the counter and remove the crusts with a bread knife.
Gently roll with the rolling pin until the bread is slightly thinner and larger.
Repeat with all eight slices.
Spread four of the slices with the miso peanut butter, leaving a half an inch uncovered all the way around.
Repeat with the other four slices with the jelly, leaving the same amount uncovered.
Match up the slices, one jelly with one peanut butter, lining up the uncovered edges of each.
Brush some water and press the fork along the edges of the sandwich to seal the edges.
Heat a sauté pan on medium heat.
Add one tablespoon of butter and let it melt.
Add the sandwich pocket to the pan and cook, monitoring closely, until it gets crispy and turns golden brown.
Flip carefully and repeat cooking on the other side.
Repeat with the remaining sandwiches.