Dissolve coffee granules in boiling water. Meanwhile, in a large bowl, combine the flour, cocoa and sugar. In a small bowl, whisk the eggs, milk, butter, vanilla and coffee mixture. Add to dry ingredients; stir just until combined.
Bake in a preheated waffle iron according to manufacturer's directions until crisp. Meanwhile, in a small saucepan, heat maple syrup. Dissolve coffee granules in boiling water; stir into syrup. Serve warm with waffles.
As a substitute for 1 cup of self-rising flour, place 1-1/2 teaspoons baking powder and 1/2 teaspoon salt in a measuring cup. Add all-purpose flour to measure 1 cup.