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Preheat oven to 350u00b0F. Line a 9x13 sheet pan with aluminum foil and spray the foil with nonstick cooking spray.
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In a medium bowl, whisk the flour, baking powder, and salt together. Set aside.
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In a large bowl, whisk the browned butter with the brown sugar until well-blended. Add the eggs and vanilla and whisk to combine. Fold the dry ingredients into the wet using a spatula. Mix just until combined; do not overmix.
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Fold in the pretzels and the white chocolate M&Ms and mix until distributed. Transfer the batter to the prepared pan and bake for 22-25 minutes. The top will be shiny and somewhat crackled. Remove and cool completely on a wire rack before cutting.
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Notes:
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To crush the pretzels, I put them in a sandwich bag and broke them with my hands until they reached the consistency I was after.
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I used the whole bag of M&Ms, which is more than 1 cup, but I didn't want them left sitting around the house. The bars will be full of them so feel free to use less.
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8
You do not have to brown the butter for this recipe. If you would rather, just melt 12 tablespoons of butter and allow it to cool before using it.
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(Recipe adapted from Cook's Illustrated New Best Recipes.)