Chocolate-Cinnamon Coffee Cake
INGREDIENTS ½ cup (1 stick) unsalted butter, room temperature, plus more for pan ½ cup blanched hazelnuts, chopped 2 ounces bittersweet chocolate, chopped ¾ teaspoon ground cinnamon 1 cup sugar 2 cups all-purpose flour ¾ teaspoon baking powder ½ teaspoon baking soda ¼ teaspoon salt 1 teaspoon vanilla extract 2 large eggs 1 cup plain whole Greek yogurt
