Best PB Cookies ever!

• 1 cup butter or margarine, softened
• 1 cup white sugar
• 1 cup brown sugar, packed
• 1 egg yolk
• 2 eggs
• 2 teaspoons vanilla extract
• 2 cups peanut butter
• 2 cups all-purpose flour
• 1 1/2 teaspoon baking soda
• 1/2 teaspoon salt

1. Preheat oven to 350 degrees.
2. In a large bowl, combine butter, white sugar, and brown sugar until blended and smooth. Add the yolk, eggs, and vanilla extract. Mix until the dough is fluffy and light.. Stir in peanut butter. In a separate bowl, sift together the flour, baking soda, and salt. Gradually stir the flour mixture into the peanut butter mixture. 
3. Refrigerate the dough for at least an hour.  
4. Roll dough into 1" sized balls. Place on the cookie sheet and flatten slightly with a fork in a crisscross pattern. Bake for 10 to 12 minutes in the preheated oven, or until the cookies no longer look moist on the top. Leave the cookies on the baking sheet a few minutes after removing from the oven so that they will continue cooking while they cool.

Amanda's Notes
These are the best peanut butter cookies ever if you like moist cookies. Every other recipe I've tried for PB cookies turn out crispy and brittle, which is not how I like my cookies. Occasionally,  I take these cookies to work - there's never a cookie left on the plate to take home!