Preheat the oven to 350 degrees F (175 degrees C). Grease cookie sheets.

Sift flour, baking powder, and salt into a medium bowl; set aside.

Beat brown sugar, butter, white sugar, orange zest, and vanilla extract together in a large bowl with an electric mixer until light and fluffy.

Beat in eggs, one at a time, beating well after each addition. Stir in flour mixture until combined; fold in chocolate chips and pecans until well combined.

Drop dough by slightly rounded tablespoonfuls 2 inches apart on the prepared cookie sheets; flatten slightly.

Bake in the preheated oven until golden, about 15 minutes. Cool briefly on the cookie sheets, then transfer cookies to a wire rack to cool completely.