Try my mom's recipe -- they're the best I've ever had:
MOM’S PEANUT BUTTER COOKIES
Annie Collins, 1911 – 1970
½ cup shortening (Crisco)
¾ cup white sugar
½ cup brown sugar
¾ cup peanut butter
Beat shortening, peanut butter, and sugars in mixer until
creamy, about 3 to 5 minutes; add egg and beat until well
1 cup sifted flour
½ teaspoon baking powder
¾ teaspoon baking soda
¼ teaspoon salt
Add about ½ the flour mixture to the creamed butter and
sugar mixture; mix on low speed until just incorporated; add
remaining flour and mix until it is just incorporated.
Roll dough into balls the size of a small walnut (about ¾
ounce each); flatten with a fork dipped in flour (make
crisscross marks on each cookie with the tines of the fork).
Bake 8 to 12 minutes at 375 degrees.
Makes about 3 dozen cookies.