Heat oven to 375 degrees. Mix shortening, butter, peanut butter, brown sugar, milk, and vanilla in large bowl. Beat at medium speed until well blended. Add egg. Beat until blended. Add flour, salt, and soda to creamed mixture. Mix until blended. Drop by teaspoons 2 inches apart onto ungreased baking sheet. Flatten slightly in crisscross pattern with fork. Bake at 375 degrees for 7 to 8 minutes.
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