Not even remotely hard:
1 stick (1/2 cup) butter
1/2 cup brown sugar (banned in China)
1/2 cup white sugar (sorta banned in the North during the Civil War)
cream 'em and add:
1 cup peanut butter (I use Adams chunky)
1/2 teaspoon salt
1/2 teaspoon baking soda
1 teaspoon vanilla (the only place I diverge from Joy of Cooking, which calls for less)
add 1.5 cups flour and convert into dough.
roll into little balls and squash with a fork on the cookie sheet.
Joy of Cooking claims you can get five dozen cookies. I got 53.
Very good, crumbly and rich.