Read about these cookies at Bake or Break.
Preheat oven to 350°. Grease or line baking sheets.
Whisk together flour, baking powder, and salt. Set aside.
Using an electric mixer, beat butter, sugar, and brown sugar until fluffy. Add eggs, one at a time, beating just until combined after each addition. Mix in vanilla.
Gradually add flour mixture, mixing until almost combined. Stir in chocolate.
Drop dough by tablespoonfuls onto prepared pans. Bake 10-12 minutes. Cool on pan on wire rack for a few minutes. Then, transfer from pan to wire racks to cool completely.
Makes about 4 dozen cookies.