1 cup powdered sugar
2 tablespoons pure maple syrup
2 tablespoons (or more) whipping cream
1 1/2 teaspoons instant espresso powder
Combine powdered sugar, maple syrup, 2 tablespoons cream, and espresso powder in medium bowl. Whisk until smooth, adding more cream by 1/2 teaspoonfuls if glaze is too thick to drizzle. Spoon glaze decoratively over top of cake; let stand at room temperature until glaze is firm, about 1 hour. DO AHEAD: Can be made 1 day ahead. Cover with cake dome and let stand at room temperature.