Preheat the oven to 350 degrees F and line a 9" square pan with parchment paper.
In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
In a separate large bowl, whisk together the melted butter and sugars until fully combined.
Mix in the eggs and vanilla.
Add in the dry ingredients, and gently fold with a rubber spatula until just combined.
Lastly, fold in the chopped candy bars.
Pour the batter into the prepared pan and smooth out the top with a rubber spatula.
Bake the blondies for about 30 minutes until evenly golden on top and toothpick inserted comes out clean.
Once the blondies come out of the oven, immediately top with more candy bars as desired.*
Allow to cool completely in the pan.
Lift the blondies from the pan, cut into 16 squares, and enjoy!