INGREDIENTS
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1/2cup(1 stick) unsalted butter, plus more for the pan
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3/4cupall-purpose flour, spooned and leveled
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1/4cupunsweetened cocoa powder
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1/2teaspoonbaking powder
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1/2teaspoonkosher salt
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6ouncessemisweet chocolate, chopped
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1cupsugar
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2large eggs
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1teaspoonpure vanilla extract
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6ounceswhite chocolate, chopped
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1teaspooncanola oil
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1/3cupchopped peppermint candies (about 15 candies)