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Preheat oven to 350 degrees F. Line a 9” x 13” baking pan with parchment paper.
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Add butter and brown sugar to the bowl of an electric stand mixer fitted with the paddle attachment. Cream the butter and sugar together on medium speed. Scrape down the sides.
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Add one egg at a time and beat until incorporated. Scrape down the sides and add in the vanilla. Mix on medium until combined.
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In a medium mixing bowl, whisk together the baking powder, salt, and flour. Add the mixture to the wet ingredients in the bowl all at once. Mix until just about combined and you can still see some flour.
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Add in half of the Kit Kat bars along with the caramel and mix until you cannot see any flour.
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Press the dough into the prepared pan in one even layer. Press the remaining Kit Kats into the top of the batter. Bake blondies for about 25 minutes until just golden on the edges. Remove from the oven and allow bars to completely cool in the pan before cutting into bars.