Preheat oven to 375°F (190°C). Line baking sheets with parchment paper or silicone liners.
Whisk together the flour, baking powder, baking soda, and salt. Set aside.
Process the oats in a food processor until finely ground. Set aside.
Beat the butter at medium speed in a heavy-duty mixer until creamy. Gradually add the sugars and beat well. Add the eggs and vanilla, beating well.
Reduce mixer speed to low. Gradually add the flour mixture, mixing just until combined.
Add the ground oats to the butter mixture, and mix just until combined. Stir in the chocolates and pecans.
Drop the cookies by tablespoonfuls onto the prepared pans. Bake for 8-10 minutes or until lightly browned. Cool slightly on baking sheets. Then, remove to wire racks to cool completely.