Preheat your waffle iron.

Whisk together cocoa powder, instant espresso, and boiling water. Add unsweetened chocolate and continue whisking until melted.

Incorporate butter and oil, then whisk in eggs, egg yolks, and vanilla until smooth.

Whisk in both sugars and salt. When fully incorporated, add flour and mix just until combined.

Spray the waffle iron with nonstick spray and drop a spoonful of batter into each quadrant.

Close and let bake until the regular ‘done’ signal. Waffles will seem too soft when you take them out - they crisp up as soon as they cool off.

Let the brownie waffles cool on a wire rack.

Optionally drizzle with melted chocolate or glaze and top with sprinkles, chopped nuts, powdered sugar, or any of your other favorites – this is a great, easy way to add extra flavor & festive colors!