1. Preheat the oven to 350 degrees. Lightly spray a loaf pan with non-stick spray, or grease with butter, and set aside.2. Whisk together the flour, baking powder, baking soda, salt, and coffee mix in a medium bowl. Set aside.3. Cream the butter and the sugar until nice and fluffy, roughly 3 minutes. Add the eggs, vanilla, and sour cream. Mix until just combined.4. Slowly stir in the dry ingredients until fully incorporated.5. Pour into your pan and bake for 45 minutes or until a toothpick comes out clean.6. Cool 15 minutes, run a knife around the edge of the pan, and gently tip out. Cool, slice, and serve.