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Preheat oven to 350 degrees F. Line a 9 x 13 inch baking pan with foil, allowing excess foil to hang over edges. Spray bottom and sides of foil with cooking spray.
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Whisk together flour, baking powder and salt. Set aside.
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In a large bowl, using a mixer, beat butter and sugar together until smooth. Add the eggs and vanilla and continue mixing until thoroughly combined. Mix in the peanut butter.
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Add the flour mixture to the peanut butter mixture and stir with a spoon until just incorporated. You may have a few flour streaks still left. (Those will get incorporated when you stir in your chips and nuts.)
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Add the peanut butter chips and the chopped peanuts and stir until evenly distributed.
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Scrape the batter into the prepared pan using a spatula to evenly spread it.
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Bake until lightly golden brown and a toothpick inserted into the center comes out with a few moist crumbs, about 20-25 minutes. (I baked mine in a convection oven, yours may take a bit longer, but check early so that you don't over bake)
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Place on a wire rack and sprinkle the chocolate chips evenly across hot blondie. Let set for a few minutes until chocolate melts.
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Spread melted chips evenly across blondie and place on a wire rack to cool completely and to allow chocolate to set.
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Use the foil overhang to pull the whole baked blondie from the pan. Cut into squares.