Add 1 cup white sugar and 1 cup brown sugar into a saucepan with ⅔ cup of room temperature water. Whisk and continue to mix together.
Cook on medium heat until it starts to boil while continuing to whisk.
Turn the heat to medium-low so that there are still plenty of bubbles. The syrup mixture should be at about 150°F ( 65 °C). Now add ½ teaspoon vanilla.
Remove from heat and allow to cool.
Transfer to glass jars or airtight containers.
