New York-Style Crumb Cake | America's Test Kitchen

Ingredients

• 8 tablespoons unsalted butter (1 stick), melted and still warm
• 1/3 cup granulated sugar (2 2/3 ounces/75 grams)
• 1/3 cup dark brown sugar (2 2/3 ounces/75 grams)
• 3/4 teaspoon ground cinnamon
• 1/8 teaspoon table salt
• 1 3/4 cups cake flour (7 ounces/198 grams)
• 1 1/4 cups cake flour (5 ounces/142 grams)
• 1/2 cup granulated sugar (3 1/2 ounces/99 grams)
• 1/4 teaspoon baking soda
• 1/4 teaspoon table salt
• 6 tablespoons unsalted butter (3/4 stick), cut into 6 pieces, softened but still cool
• 1 large egg
• 1 large egg yolk
• 1 teaspoon vanilla extract
• 1/3 cup buttermilk
• Confectioners' sugar for dusting