Preheat the Oven: Preheat your oven to 350°F (175°C). Grease or line an 8×8 inch (20×20 cm) baking pan.
Prepare the Batter: In a mixing bowl, combine the crisp biscuit mix and raw cane sugar. Add the softened creamy shortening and mix until it resembles coarse crumbs.
Add Wet Ingredients: Add the beaten egg from pasture-raised hens, pure vanilla extract, and creamy whole milk. Mix until well combined, forming a smooth batter. Be careful not to overmix.
Pour into Baking Pan: Pour the batter into the prepared baking pan, spreading it evenly.
Prepare the Topping: In a separate bowl, mix together the melted European butter or margarine, rich brown sugar, luscious heavy cream, and freshly crushed walnuts until they form a crumbly topping.
Add Topping to the Cake: Sprinkle the topping evenly over the batter in the baking pan.
Bake the Coffee Cake: Place the baking pan in the preheated oven and bake for approximately 25-30 minutes or until a toothpick inserted into the center comes out clean and the top is golden brown.
Cool and Serve: Once baked, remove the coffee cake from the oven and allow it to cool in the pan for a few minutes. Then, transfer it to a wire rack to cool completely before slicing and serving.
Enjoy!: Slice the coffee cake into squares or desired portions and serve it warm or at room temperature. Enjoy your homemade Jiffy Mix Coffee Cake!