Nanny's Peanut Butter Cookies

Got milk ???

1 cup softened butter

1 cup white sugar

2 egg

1 cup brown sugar (packed) 

1 egg yolk

2 teaspoons vanilla extract

1 (18 ounce) jar peanut butter

2 cups all-purpose flour

1 teaspoon baking soda

1/2 teaspoon salt

1 cup chopped peanuts

In a large bowl, cream butter, white sugar, and brown sugar until smooth.
Add the eggs, yolks, and vanilla; mix until fluffy.
Stir in peanut butter.
Sift together the flour, baking soda, and salt; stir into the peanut butter mixture.
Stir in the peanuts.
Refrigerate the dough for at least 2 hours.
Roll dough into walnut sized balls.
Place on the prepared cookie sheet and flatten slightly with a fork.
Bake for 12 to 15 minutes at 350 degrees. 
These cookies taste great when slightly undercooked.