Heat oven to 350F. In large mixer bowl beat butter, sugar, brown sugar, egg and vanilla extract until well blended. Combine flour, baking soda, baking powder and salt; add alternately with buttermilk to creamed mixture. Stir in 1 cup each vanilla and chocolate chips. Measure by 1/4 cupfuls onto ungreased cookie sheet; bake 12 to 14 minutes or until lightly browned. Cool slightly; remove from cookie sheet. Cool on wire rack.
Makes about 20 cookies.
*To sour milk: Use 1-1/2 tsp vinegar plus milk to equal 1/2 cup.
Cajun Country -- New Iberia, Louisiana