Chocolate-Cinnamon Coffee Cake Recipe - (4.6/5)

Ingredients

• Special Equipment:
• 1/2 cup (1 stick) unsalted butter, room temperature, plus more for pan
• 1/2 cup blanched hazelnuts, chopped
• 2 ounces bittersweet chocolate, chopped
• 3/4 teaspoon ground cinnamon
• 1 cup sugar, divided
• 2 cups all-purpose flour
• 3/4 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/4 teaspoon kosher salt
• 1 teaspoon vanilla extract
• 2 large eggs
• 1 cup plain whole Greek yogurt
• 8-inch square baking pan