Heat a griddle to 350°F or warm a skillet over medium heat.
Whisk the flour, sugar, baking powder, and salt in a small mixing bowl.
Add the oil (or melted butter) and the smaller amount of milk for the batch size (use 1/4 cup milk for the smaller flour/sugar set or 1/2 cup for the larger set) and whisk until combined.
Gradually add more milk as needed to reach a batter that easily runs off the whisk back into the bowl; it should be pourable but not watery.
If the batter sits while the pan heats it may thicken; thin with a little more milk if needed.
Ladle or spoon batter onto the preheated griddle or skillet to form pancakes.
Cook until bubbles form on the surface and begin to pop and the bottoms are golden, then flip and cook until the second side is golden and cooked through.
Serve hot with syrup or toppings of choice.