Preheat oven to 350°F (175°C) and grease two round cake pans.

In a bowl, whisk together flour, sugar, baking powder, ground coffee, and walnuts.

In another bowl, beat softened butter until creamy; gradually add sugar until fluffy.

Mix in eggs one at a time, followed by whole milk until well combined.

Gently fold dry ingredients into the wet mixture until just combined.

Divide batter between prepared pans and bake for 25-30 minutes or until golden brown and a toothpick comes out clean.

Allow cakes to cool completely before frosting.