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["Grease and flour a 9""x13"" baking dish.", "With an electric mixer, combine the flour, baking powder, baking soda, salt, sugar, 1/2 cup of the dark brown sugar, 1 teaspoon cinnamon, cocoa powder, butter, milk, eggs, and vanilla and beat together well.", "Pour the mixture into the greased dish, then cover with plastic wrap and chill in the refrigerator overnight or for 8 hours.", "When ready to bake the coffee cake, preheat the oven to 350 degrees F.", "Take the remaining brown sugar and cinnamon, the pecans, and cashews (if using) and combine them in a bowl.", "Sprinkle the mixture over the refrigerated batter in the dish and then bake for 30 to 35 minutes or until an inserted knife or toothpick comes out clean.", "Cut into squares and serve immediately while it is warm."]
