"Complete with toasted marshmallow frosting, these s'mores brownie cupcakes can't be beat! Indulge in the best homemade brownie cupcakes!..."
INGREDIENTS
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1 and 1/2 cups (150g) graham cracker crumbs (about 10 full-sheet graham crackers)
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1/3 cup (67g) granulated sugar
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6 Tablespoons (87g) unsalted butter, melted
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1/2 cup (1 stick; 115g) unsalted butter
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2 4-ounce quality semi-sweet chocolate bars (228g or 8 ounces), coarsely chopped
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1 cup (200g) granulated sugar
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3 large eggs, at room temperature
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1 teaspoon pure vanilla extract
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1/2 cup (60g) all-purpose flour (spoon & leveled)
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1/4 cup (20g) unsweetened natural or dutch-process cocoa powder
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1/2 teaspoon salt
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3 large egg whites, at room temperature
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3/4 cup (150g) granulated sugar
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1/4 teaspoon cream of tartar (do not skip!)
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1 teaspoon pure vanilla extract