How To make Peanut Butter Cookies, Joyce's

1 c Shortening
1 c Peanut butter
1 c Sugar
1 c Brown sugar
2 Eggs
2 3/4 c Flour
2 ts Soda
1 ts Baking powder
1/2 ts Salt
Mix all to - gether and form into small balls and flatten with fork. Bake in 350 oven 12 - 15 minutes