Build the base: Lay 12 pretzels on a parchment-lined sheet. Spread 1 teaspoon of peanut butter on each, then top with another pretzel to make sandwiches.
Melt and color chocolate: Combine white chocolate and coconut oil in a microwave-safe bowl. Heat in 20-second intervals, stirring until smooth. Add green food coloring until you reach a Frankenstein shade.
Dip and coat: Submerge each pretzel sandwich in green chocolate. Shake gently to remove excess and place on parchment paper.
Add Frankenstein’s hair: While still wet, sprinkle the top edge with chocolate jimmies.
Bring him to life: Press candy eyes into place. Use a piping bag with melted chocolate to draw mouths, scars, or stitches.
Attach bolts: Break mini pretzels and insert one on each side of the head for bolts.
Set and enjoy: Let set completely at room temp or speed things up with a quick chill in the fridge.