Heat oven to 350°F. Spray a 13x9-inch pan with non-stick baking spray. In a small bowl, mix the flour, baking powder, and salt.Set aside. Add the softened butter, granulated sugar, and brown sugar.Mix using an electric mixer on medium speed for 2 minutes.One at a time, beat in eggs until smooth. Add the vanilla, stirring to combine. Add just one-third of the flour mixture, mixing on low to combine. Add half of the milk, beating until combined. Repeat with flour mixture and milk.Add in the baking chips and pecans. Stir in to combine. Spread pecan batter evenly in your pan.
Bake 25 to 30 minutes.Verify the bars are fully cooked by inserting a toothpick in the center. If it comes out clean, the bars are done. If not, add time accordingly.Allow to cool completely. Slice into 12 bars.