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.