Peanut Butter Cookies

1 cup margarine (2 sticks--softened)
1 cup peanut butter
1 cup sugar
1 cup brown sugar
2 eggs
2 1/2 cups flour
1 1/2 teaspoons baking soda
1 teaspoon baking powder
1/2 teaspoon salt

Mix first five ingredients well. Measure last four together and 
add gradually to the wet mixture. Chill. Form balls and place 
crisscross with a fork on greased cookie sheet. Bake at 375 degrees 
for 10-12 minutes or until set but not hard.