Brew coffee. Meanwhile, with a whisk, stand mixer, or hand mixer, whip heavy cream until foamy but not fully whipped, about 3 minutes.
Pour 4 ounces of coffee into each serving glass. Add 1 teaspoon of sugar and Irish whiskey, stir to combine and melt sugar.
Spoon cream over Irish coffee so it layers on top. Serve.
Notes
Use good quality coffee. If using an espresso maker, brewing an americano is a great option.Cream consistency should be almost fully whipped. Place it carefully on the coffee so it layers.Garnish with cinnamon, cocoa powder, or chocolate shavings.