Line a 12-cup mini muffin pan with paper liners.
Melt chocolate chips with coconut oil in a microwave-safe bowl, heating in 20–30 second bursts and stirring until smooth.
Spoon about 1 teaspoon melted chocolate into each liner and tilt or tap to coat the bottom. Chill 5 minutes to set slightly.
Stir together peanut butter, powdered sugar, vanilla, and salt until thick and spreadable.
Portion a rounded teaspoon of peanut butter mixture onto each chocolate base and gently flatten.
Add a small dollop of jam on top of the peanut butter in each cup.
Cover each cup with enough melted chocolate to seal, then tap the pan to level. Sprinkle peanuts on top if using.
Chill until firm, about 15–20 minutes. Serve or store covered in the fridge.