Peanut Butter Cookies

It's about time updating this site. I don't remember the source of this recipe, but it's my favorite peanut butter cookie recipe.

Ingredients (3 groups):

Dry ingredients (medium bowl)
- 2 1/2 cups all-purpose flour
- 1 1/4 tsp baking powder
- 1/2 tsp baking soda
- 1/4 tsp salt

Egg mixture (small bowl)
- 1 large egg
- 1 large egg yolk
- 2 1/2 tsp vanilla extract

Butter mixture (large bowl)
- 1/4 cup oil
- 2/3 cup smooth peanut butter
- 1 1/2 stick unsalted butter, room temperature
- 1/3 cup powdered sugar
- 1 cup packed brown sugar

Mix each group of ingredients in their bowls. For the butter mixture, it might be easier to start mixing butter and peanut butter first, add oil and mix well, and then add sugars and mix. Or, you could use large stand mixer (butter mixture will be the main bowl) In the large bowl with butter mixture, add egg mixture, stir well. Add the dry ingredients, stir till they are incorporated. Dough can be greasy, but because of it, it is easy to roll into balls.
Make 1 inch balls and place on cookie sheet 2 inch apart. Press with fork to make pattern.
Bake in preheated oven at 350F for 8-12 minutes.
Makes about 3 dozens.