In a large bowl, mix butter, shortening, peanut butter, granulated and brown sugars, and eggs. If you use a mixer, blend on medium.

Separately, mix together flour, baking soda, baking powder, and salt. Add to other mixture. If you use a blender, start on low speed (don't want to poof flour everywhere!)

Mix in chocolate chips.

I love recipes that you can freeze - this freezes great! If you're going to freeze, make large tablespoon-sized balls and lay them out in a Tupperware container separating each layer with parchment or wax paper.

If you're going to cook right away, preheat oven to 400F and place the the tablespoon-sized balls onto a cookie sheet lined with Silpat pad or parchment paper.

Bake 8 to 10 minutes from room temp, or 12 - 14 minutes from frozen. Time depends a lot on just how big you make them - what you're looking for is a nice golden doneness.

Let cool on the cookie sheet