Add the water and sugar to a small saucepan. Cut a vanilla bean in half (lengthwise) and place it into the pot. (If you are using vanilla extract instead, add it to the syrup once cooled.)
Bring the syrup to a boil over medium-high. Then reduce to medium-low and simmer for about 5 minutes. Remove from the heat and set aside to cool.
Once cooled, remove the vanilla bean from the pot and pour the syrup into an airtight container. Store in the fridge for up to 2 weeks.
Matcha Latte
Add the milk and matcha powder to a 16-ounce glass. Mix with a milk frother (or a spoon) until completely combined. (see note)
Add 1 tablespoon of the vanilla syrup (or more to your taste) and mix again. Fill the glass with ice cubes and enjoy immediately!
Notes
When frothing your milk, it can significantly rise in the cup, so you want to use a bigger glass than needed. Alternatively, you can mix the matcha with ½ the amount of milk and mix. Then add the rest of the milk and gently mix again. The bubbles/foam that rise to the top will dissipate as you stir your drink.
This vanilla simple syrup recipe makes about 2/3 cups of syrup, which is a little over 10 tablespoons.
Nutritional information is for the latte part of the recipe only and uses 2% milk for reference.