Preheat the oven to 180 degrees C. Brush the 8” pans with oil and line the bottom of it with a baking paper disc. Then line the sides with cocoa powder. Set aside.
In a big bowl, mix the flour, sugar, cocoa, baking powder, baking soda, and salt with a whisk.
Then, using a stand mixer (or a hand mixer) add in the wet ingredients, one by one. The oil, then the egg, vanilla, milk, and last, (slowly) the boiling water + coffee.
Pour the cake mix into the pans equally and bake at 180 degrees C for 25 to 30 minutes or until a skewer comes out with little crumbs.