Follow these simple steps to create your delicious Coffee and Walnut Cake:

1. Preheat the Oven: Begin by preheating your oven to 180°C (350°F). Grease and flour two 8-inch round cake pans or line them with parchment paper.

2. Prepare Coffee Mixture: In a small bowl, dissolve the instant coffee granules in boiling water. Set aside to cool.

3. Mix Dry Ingredients: In a large mixing bowl, sift together the flour, baking powder, and salt. Set aside.

4. Cream Butter and Sugar: In another bowl, beat the softened butter and granulated sugar together until light and fluffy.

5. Add Eggs: Add the eggs to the butter mixture one at a time, ensuring each is well incorporated before adding the next.

6. Incorporate Coffee: Add the cooled coffee mixture and vanilla extract to the butter and egg mixture. Mix until combined.

7. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, alternating with the whole milk. Mix gently until the batter is smooth.

8. Fold in Walnuts: Gently fold in the chopped walnuts, ensuring they are evenly distributed.

9. Divide Batter: Pour the batter evenly into the prepared cake pans.

10. Bake: Place in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.

11. Cool the Cakes: Remove the cakes from the oven and let them cool in the pans for about 20 minutes. Then, transfer them to a wire rack to cool completely.

12. Prepare Frosting: For the frosting, beat the softened butter until creamy. Gradually add the powdered sugar, mixing well after each addition. Incorporate the brewed coffee until you achieve a smooth, spreadable consistency.

13. Assemble the Cake: Once the cakes are completely cool, place one layer on a serving plate. Spread a layer of frosting on top, followed by the second cake layer. Frost the top and sides of the cake, smoothing it with a spatula.

14. Garnish: Top the frosted cake with additional chopped walnuts if desired.

By following these steps, you’ll create a stunning Coffee and Walnut Cake that is sure to impress!