"Moist coffee cake swirled and studded with dark chocolate..."
INGREDIENTS
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For Coffee Cake: * 2¼ teaspoons (one envelope) active dry yeast * ¼ cup plus 2 tablespoons (plus an extra pinch) of granulated sugar * ¾ cup warm milk, 110° F * 1 large egg plus 1 large egg yolk * 3 cups all-purpose flour * &