Line an 8x8 inch baking pan with foil. (I just cover the bottom and two sides.)
Remove the lids and seals from the peanut butter and frosting. Place in the microwave on a paper plate, in case they dribble over, and cook for 1 minute to melt both items. The peanut butter may need another 30 seconds to 1 minute to melt into a liquid state. This is just before I put them in the microwave.
Pour each item into a large mixing bowl. The frosting was perfect at 1 minutes so I poured that in and the peanut butter was nuked for another 30 seconds,
Mix together well.
Pour into the prepared pan and spread out evenly.
If you want to add a topping, do so now, and gently press them if needed. I added a 10 oz (283 g) bag of dark chocolate chunks.
Let cool to room temperature then place in the fridge for 1-2 hours to firm up.
Remove from the fridge when set well, run a butter knife along the two sides where there is no foil, unwrap the ends of the foil from the pan, and lift the fudge out and place on a cutting board.
Cut into squares, making sure no foil is on the bottom of the pieces and place on a serving tray. Serve and enjoy.
With chocolate frosting and caramel bits on top. Delicious!