• Prepare a 9x13 baking dish with cooking spray and set aside.
• In a large bowl, mix 1 cup sugar and ½ cup dark brown sugar with the melted butter.
• Add eggs and mix until well blended.
• In another bowl, mix the flour, baking soda, baking powder, salt, cinnamon and cardamom.
• Stir dry ingredients into the egg batter.
• Add buttermilk and nuts and mix until well blended.
• Pour mixture into prepared 9 X 13 baking dish.

Make the topping:

• Combine ⅓ c dark brown sugar, 3 tsp. of cinnamon, and chopped walnuts to create a crumble topping.
• Sprinkle the mixture on top of the cake. Take a knife and run it up and down the cake pan about 4 times to barely mix in the crumble, but keeping most on top.
• Cover and refrigerate overnight.
• When you wake up on Christmas morning, bake bread at 350 degrees for 30-40 minutes, depending on if the dish is cold just coming out of the fridge, or if it has sat on the counter to warm up.
• Watch the baking time - according to your oven and how cold the prepared cake is, to not over bake the cake.
• Serve with coffee and hot cocoa on Christmas morning!