Set oven to 350°.
Grease a 9-inch square baking dish.
In a large bowl, combine the flour, coffee granules, brown sugar, cinnamon and salt; mix well with a spoon to combine.
With a pastry blender/knife cut in the COLD butter until crumbly and well blended.
Press half of the mixture into a prepared baking pan; set aside.
In a medium bowl whisk together the sour cream and baking soda; add in the egg, and whisk until combined.
Add sour cream/egg mixture to the remaining crumb mixture, stiring gently JUST until combined.
Pour over the crumb crust in the pan.
In a small bowl, combine the nuts and chocolate chips.
Sprinkle over the top of cake.
Bake for 30-35 minutes or until done.