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Preheat oven to 350 degrees and line a 9x9 baking pan with non-stick foil (this makes it extremely easy to cut the bars, because you can just lift the foil out of the pan and slice).
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With a standing or handheld mixer, cream butter until light and fluffy, about 1 minute. Add in brown sugar and granulated sugar, and cream the mixture until well combined.
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Add in the eggs, one at a time, beating well after each addition.
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Add in vanilla extract and mix.
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Mix flour, baking powder, salt, and ground cinnamon together. Add the dry ingredients into the wet ingredients and mix until well combined.
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Add in peaches.
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Pour mixture into prepared baking pan, and spread in an even layer.
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Bake for 25-30 minutes, or until the peach blondies are lightly golden brown and no longer wet in the center.