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Preheat the oven to 350°F. Line a 8x8-inch baking pan with parchment paper or foil, leaving a 2-inch overhang on at least 2 of the sides.
In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.
In a large mixing bowl, whisk to combine the brown sugar and melted butter. Add the egg, and vanilla and whisk vigorously until the mixture is thick and well combined.
Add the dry mixture to the wet mixture and stir together with a spatula until almost combined. Add ¾ cup of mix-in’s and stir until they are well distributed.
Transfer the dough to the prepared baking pan and spread into an even layer. Press the remaining ¼ cup of mix in’s into the top.
Bake for 32 to 36 minutes or until the edges are set and golden brown and a toothpick inserted into the center comes out clean. Let the cookie bars cool completely in the pan before cutting.