Line an 8x8 baking dish with parchment paper, set aside.
In a small saucepan over medium heat, melt the butter. When melted, whisk in the marshmallow fluff, peanut butter and salt until smooth, approximately 1 minute.
Place half of the cereal in a large mixing bowl (bigger than you think you need ) and pour half of the marshmallow mixture in, then top with the rest of the cereal and the last of the peanut butter mixture. Using a wooden spoon or spatula, toss until evenly covered.
Press half of the Rice Krispie mixture into the bottom of the prepared pan. Spread your favorite jelly over top. Finish with the remaining Rice Krispie mixture, evenly and gently pressing into the pan.
Chill in the fridge for 20 minutes before cutting into squares. Store covered at room temperature.
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Notes
The marshmallow mixture can also be made in a medium microwave-safe bowl heated at 30 second increments until smooth.
Chilling is not necessary, but the hardening helps to cut them into squares without squeezing out all of the jelly.
Regular marshmallows can be substituted, use 5 1/2 cups of miniature marshmallows.