INGREDIENTS
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12 ounces bittersweet chocolate (chips or a block chopped into small pieces)
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2 cups toasted walnuts or pecans, chopped (optional)
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10 tablespoons (5 ounces) unsalted butter, cut into pieces, at room temperature, plus more for the baking pan and as needed
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1 tablespoon vanilla extract
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20 regular-size marshmallows (“regular” as in not “mini” and not “jumbo,” but the usual large-ish size you snatch up to make s’mores; 5 1/4 ounces/150 grams)
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4 cups granulated sugar
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Two 5-ounce cans evaporated milk