Add the gluten-free flour, granulated sugar, and salt to a large mixing bowl.
Make a well in the center and add the milk, water, eggs, melted butter, and vanilla extract. Mix until combined.
Cover and let the batter rest for 30 minutes to thicken slightly.
Preheat a large non-stick skillet or crepe pan over medium heat.
Grease the skillet with butter in a thin layer. Wipe away any excess so your crepes brown evenly. Sometimes the first crepe will have some irregular browning due to the butter, but I find the subsequent crepes all cook more consistently.
Pour 1/4 cup of crepe batter in the preheated pan and swirl the pan quickly to spread the batter around so it’s even and thin. It should be about 8-inches in diameter.
Cook for 1-2 minutes, until the edges are set. Then flip the crepe with a rubber spatula being careful not to break the crepe. Cook for an additional minute on the second side.
Remove and place on a plate in a stack covered with a towel to keep the crepes warm. Repeat with the remaining batter.
Fill the crepes with your favorite fillings and either roll the crepes up into cylinders or fold them in half and then half again for a triangle shape. Serve immediately.