Instructions: Preheat oven to 375. Cream butter, peanut butter, and sugars together in mixing bowl until light and fluffy. Add egg and vanilla; beat well. Sift flour, soda, and salt together; blend into creamed mixture. Shape dough into 1-inch balls. Arrange 2 inches apart on ungreased baking sheet. Press balls of dough with floured fork to flatten and make a criss-cross design.

Bake for 10 to 12 minutes or until golden brown. Cool on wire racks.

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