In a large bowl using an electric hand mixer (or in the bowl of an electric stand mixer fitted with the paddle attachment), whip together the softened butter and sugars until light and fluffy, 2-3 minutes. Add the eggs and vanilla and mix until combined.
Add the flour, baking powder, and salt and combine until barely blended. Stir in 1 cup of chocolate chips. Press the dough into the prepared pan. Sprinkle the remaining ½ cup chocolate chips on top. Bake the bars for 30 minutes until set (be careful not to overbake!).
Recipe Notes
Vanilla: I love using this clear Mexican vanilla (aff. link) in these cookie bars. It’s my favorite.
Chocolate Chips: I prefer dark Ghiradelli chocolate chips (aff. link) in these cookie bars, but you can use whatever kind you like.
