Peanut butter No Bake cookies

1 cube butter
1/2 cup milk
2 cups sugar
1/4 tsp salt

Bring to a boil and boil for 2 mins. Take off heat.  Add:
1 tsp vanilla
2 tsp cocoa
1/2 cup peanut butter
3 cups oats

Drop on wax paper and serve when completely cooled.