For the Cake

• 8 tablespoons unsalted butter, softened to room temperature
• 1 cup granulated sugar
• 1/4 cup brown sugar, packed
• 2 eggs, beaten
• 1/2 cup plain yogurt
• 1/2 cup buttermilk
• 2 teaspoons vanilla extract
• 2 1/2 cups unbleached, all purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 2 teaspoons ground cinnamon
• 1/4 teaspoon ground nutmeg
• 1/4 teaspoon ground ginger
• 1/4 teaspoon ground allspice
• 1/2 teaspoon sea salt
• 2 cups apples, peeled and diced (I used Granny Smith and Gala apples)

For the Crumb Topping

• 1 cup apples, peeled and diced (I used Granny Smith and Gala apples)
• 2 1/2 cup unbleached, all purpose flour
• 3/4 cup brown sugar, packed
• 1/4 cup granulated sugar
• 8 tablespoons unsalted butter, chilled and cut into cubes
• 1 tablespoon ground cinnamon
• 1/8 teaspoon ground nutmeg
• 1/8 teaspoon ground ginger