Preheat your oven to 350°F (175°C) and grease a cake pan with butter or non-stick spray.
In a mixing bowl, cream together the softened butter and granulated sugar until light and fluffy.
Add the eggs one at a time, beating well after each addition.
Stir in the Greek yogurt, buttermilk, and applesauce until well combined.
In a separate bowl, whisk together the all-purpose flour, baking powder, baking soda, salt, instant coffee powder, and cinnamon.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Avoid overmixing, as it may result in a dense cake.
Pour the batter into the prepared cake pan and smooth the top with a spatula.
Bake in the preheated oven for approximately 40 minutes or until a toothpick inserted into the center comes out clean.
Once baked, remove the cake from the oven and let it cool in the pan for 10 minutes. Then transfer it to a wire rack to cool completely.
Serve slices of this delectable coffee cake and savor the unique flavors that will tantalize your taste buds.