Preheat oven to 375 degrees F. Have ready two ungreased baking sheets.

In a bowl, mix together the flour, baking soda and salt. Set aside.

In a mixing bowl, using an electric mixer, beat the butter, peanut butter, brown sugar and granulated sugar.

Beat in the egg and vanilla, scraping down the side of the bowl. When fully blended, stir in the flour mixture to make a dough, then stir in the chocolate chips.

Using a rounded tablespoon, portion about 36 balls of dough and arrange on baking sheets (ungreased).

Bake one sheet at a time for 8 to 10 minutes. If you bake two sheets at a time, bake on upper rack and one lower and switch halfway through.

Remove from baking sheets and let cool on a rack.