Preheat the oven to 350 degrees F. Lightly grease a 9x9-inch baking pan, set aside.
In a medium bowl whisk together the flour, sugar, salt and baking powder
In a separate large bowl combine the cookie butter, brown sugar, eggs, butter, milk and vanilla extract until everything is well mixed.
Slowly add the flour mixture to the wet ingredients and mix until well combined.
Fold in the chocolate chips
Spread batter evenly into prepared pan. Bake in the preheated oven for 20-25 minutes, until a toothpick inserted into the center comes out clean. Cool completely, then cut and serve.