Pull 1 to 2 shots (1 to 2 ounces) of fresh espresso directly into a warmed 8 to 10-ounce coffee cup to preheat the cup.

Stir 1/2 to 1 teaspoon French vanilla syrup or vanilla extract into the hot espresso until fully dissolved, blending the flavor evenly.

Pour 4 ounces of cold whole milk into a milk pitcher, filling it about one-third full to allow room for frothing.

Position the steam wand just below the milk surface at a slight angle and start steaming to create a whirlpool; aerate for about 2 seconds until you hear a gentle hissing sound.

Submerge the steam wand deeper into the milk and continue steaming until the milk temperature reaches 150 to 155°F, about 30 to 45 seconds, creating silky microfoam.

Turn off the steam wand and remove it; tap the pitcher on the counter and swirl the milk gently to pop any large bubbles and integrate the foam.

Slowly pour the steamed milk into the espresso, starting from a higher pour and lowering as the cup fills to achieve equal parts espresso, steamed milk, and microfoam.

Finish by spooning or pouring the remaining microfoam on top to form a thick, velvety layer.

Garnish with a pinch of ground nutmeg or cinnamon if desired to add a subtle spice note.

Serve the French vanilla cappuccino immediately to enjoy the optimal texture and temperature.