Preheat oven: Preheat the oven to 356ºF (180ºC). Line a round 8 or 9-inch baking pan with parchment paper, and set aside. Note: Alternatively, if you have a non-stick pan, liberally grease it with softened/spreadable butter and dust it with a light layer of cocoa. This will leave your finished cake with smooth sides.
Mix Dry Ingredients: Sift the flour, cocoa powder, baking powder, and baking soda into a large mixing bowl. Whisk in the instant coffee powder, caster sugar, and brown sugar until well combined.
Add Wet Ingredients: Add the egg, room temperature water, olive oil, and vanilla extract. Gently fold with a spatula until incorporated, do not overmix.
Incorporate Boiling Water: Slowly pour in the boiling water. Gently fold with a silicone spatula until a smooth, slightly thin batter forms. Take your time to mix it evenly.
Transfer to Pan & Bake: Pour the batter into the prepared pan. Bake for 32–35 minutes, or until a skewer inserted into the center comes out clean or with a few moist crumbs.
Cool the Cake: Let the cake cool in the pan for 15 minutes. Then carefully transfer to a wire rack to cool completely before icing.
Chocolate Icing
Prepare Icing: In a medium bowl, sift together the powdered sugar and cocoa powder. Add 2–3 tablespoons of room temperature water and whisk until smooth and thick.
Glaze & Serve: Pour the icing over the cooled cake, spreading it gently. Let it drizzle slightly over the sides and set before slicing and serving.
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Notes
Store: Keep your cake in an airtight container at room temperature, where it will stay fresh for up to three days.Freeze: For extended storage, wrap the cake well and freeze it for up to three months.Thaw: When ready to serve, thaw the cake in the refrigerator overnight or for several hours at room temperature until soft.