OH man I don't want everyone on here to have it but here it is.    
2 sticks of butter, use butter that has been sitting out and is soft.   
One 18 oz jar of peanut butter
One large  plastic jar of marshmallow
2 pounds of 10X sugar, yes 2 pounds.  
Grease  a 13 x9 cake pan with butter.
Now in a microwave  safe (large) bowl put your butter, peanut butter, and marshmallow. 
Microwave for 2 minutes remove and stir until all the marshmallow is melted but do it fast so it doesnt get cold.
Now add your 2 pounds of sugar and mix. Watch it will be warm and could be hot.  You will have to use your hands.  Mix until well blended.
Place in the cake pan and push down.  The fudge will be thick so you will need to use your hands again to push it down.   Cover with plastic wrap and place in refrigerator until cold,  about 3 hours.   Enjoy.   
If you want to make chocolate fudge use a bag of chocolate chips instead of the peanut butter.  
Let me know if you make it.