For the spiced apples, preheat the oven to 400 degrees F. Spray an 8x8 inch baking pan with nonstick spray and set aside.
In a medium bowl, toss together the apples, brown sugar, granulated sugar, cinnamon, cornstarch, cardamom, nutmeg, and salt until fully coated. Pour the apples into the prepared baking dish and dollop the top with butter. Cover with foil and place in the oven. Bake for 30-35 minutes or until the apples are tender. Remove from heat and set aside while you prepare your dutch baby.
Preheat your oven to 425 degrees F.
In a large bowl, whisk together the flour, sugar, cinnamon, cardamom, salt and nutmeg. Add the eggs, buttermilk and vanilla extract. Whisk until smooth, and then set aside.
Place a 10-inch cast iron skillet over medium low heat. Add the butter and melt. Remove from heat and pour the batter into the pan. Place the pan immediately in the oven and bake for 20-25 minutes or until the dutch baby is puffed up and brown. Remove from the oven and let cool slightly for 1 minute.
Decorate the dutch baby by topping with almonds, powdered sugar and spiced apples. Enjoy!