Blend the liquid ingredients (milk, egg, melted butter, vanilla and sugar) together, then add the flour and blend until incorporated.
Set the burner to medium and preheat your frying pan. Spray the pan with non-stick spray and pour in about 1/3 cup of batter. Tilt the pan and swirl around to create a thin round pancake. Imperfect rounds are absolutely fine!
When surface is dry and edges are turning golden, run a spatula (metal for a stainless pan, silicone for non-stick) under the pancake to ensure that it's loose, then flip the pancake over.
Continue cooking until the second side is turning golden, then fold into thirds. You can keep warm in a 200F oven if desired.
Scrape or wipe pan between pancakes and re-spray. Continue until batter is used up.
Notes
Using two frying pans will speed up the cooking time!
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.