In a large bowl, whisk the egg (or egg replacer), granulated sugar, pure vanilla extract, and the vegetable oil together.
Add the gluten-free flour, xanthan gum (leave out if your flour already has it), gluten-free baking powder, and salt to the egg mixture and mix until fully combined.
Stir in milk and mix until smooth. For thinner pancakes, stir in 1 to 2 tablespoons of milk.
Scoop the batter into a 1/4 cup measuring cup and pour the batter onto a greased griddle or pan for each pancake. Heat electric griddle to 350°F for even cooking.
Cook the pancakes until the batter starts to bubble and pancakes start to puff. Flip the pancakes and cook until they are golden brown.
Top with butter, syrup, or favorite topping. Enjoy!