Step 1

Heat oven to 375ºF.

Step 2

Mix first 3 ingredients until blended. Beat peanut butter, butter and sugars in large bowl with mixer 4 min. or until very creamy. Add egg and vanilla; beat 3 min. or until fluffy. Stir in flour mixture until blended. Stir in remaining ingredients.

Step 3

Drop heaping tablespoonfuls of dough, about 1 inch apart, onto baking sheets; press lightly to flatten to 2-inch diameter.

Step 4

Bake 9 to 10 min. or until lightly browned. (Do not overbake.) Cool on baking sheets 5 min. Remove to wire racks; cool completely.