S'mores Sweet Potatoes

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4 tablespoons unsalted butter, melted, plus an additional 1 tablespoon for greasing pan

3 pounds sweet potatoes, peeled and thinly sliced into 1/8-inch rounds

1 tablespoon Dutch process cocoa powder

1 tablespoon granulated sugar

3/4 teaspoon ground cinnamon

1/2 teaspoon chipotle powder

3/4 teaspoon kosher salt

1 1/2 cups roughly crushed graham cracker crumbs

1 cup half-and-half

4 cups miniature marshmallows