I made this yesterday and it is soooo good. I added mini marshmallows, but it is a fun easy snack and I usually have these things on hand. Perfect for a craving. If you have chocolate chips you could pour them on top let them melt and spread it on top then you would have a peanut butter cup type thing.
1 cup butter, plus more for greasing pan
1 cup peanut butter
1 teaspoon vanilla
1 pound powdered sugar
Microwave butter and peanut butter for 2 minutes on high. Stir and microwave on high for 2 more minutes. Add vanilla and powdered sugar to peanut butter mixture and stir to combine with a wooden spoon. Pour into a buttered 8 by 8-inch pan lined with waxed paper. Place a second piece of waxed paper on the surface of the fudge and refrigerate until cool. Cut into 1-inch pieces and store in an airtight container for up to a week.