INGREDIENTS
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For the cake:
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2 1/4 teaspoons (one 1/4-ounce envelope) active dry yeast
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1/4 cup plus 2 tablespoons plus a pinch of granulated sugar
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3/4 cup warm milk (110 degrees)
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1 large egg plus 1 large egg yolk
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3 cups all-purpose flour, plus more for surface
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Coarse salt
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1 stick unsalted butter, room temperature, plus more for bowl, pan, and parchment
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1 large egg, lightly beaten with 1 tablespoon heavy cream, for egg wash
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For the filling:
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8 ounces bittersweet chocolate, coarsely chopped (1 1/4 cups)
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1/2 cup granulated sugar
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2 teaspoons ground cinnamon
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4 tablespoons unsalted butter, room temperature, cut into small pieces
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For the crumb topping:
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1/4 cup plus 2 tablespoons confectioners' sugar
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1/4 cup all-purpose flour
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3 tablespoons unsalted butter, room temperature