Step 1

Grease an 8X8 inch pan with butter, and then line with parchment paper (this will make the removal of the fudge much easier).

Step 2

In a large glass bowl, combine the butter and peanut butter and cover with a paper towel. Microwave for about 2 minutes on high.

Step 3

Stir and microwave for 1-2 more minutes depending on the wattage of your microwave. Carefully remove it from the microwave because it will be very hot!

Step 4

Add the powdered sugar (and vanilla if you're using it) to the melted peanut butter mixture, and stir with a wooden spoon or spatula until it's well combined.

Step 5

Use a spatula to spread the mixture into your lined pan, and allow it to cool on the counter for about 10 minutes. Cover with plastic wrap, foil or a lid, and refrigerate for at least 2 hours.

Step 6

Once cooled, carefully turn the pan upside down onto a cutting surface so that the fudge falls out. Remove the parchment paper and cut into small pieces.

Step 7

Store the fudge in your refrigerator, and enjoy for up to 2 weeks!