Mix: In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
Combine: In another bowl, mix milk, egg, vanilla extract, and melted butter.
Blend: Pour the wet ingredients into the dry ingredients and stir until just combined (do not overmix).
Heat: Preheat a non-stick skillet or griddle over medium heat and grease lightly with cooking spray or butter.
Pour: Using a teaspoon or small scoop, pour small dollops of batter onto the skillet.
Cook: Wait until bubbles form on the surface and the edges set, then flip and cook until golden brown on both sides.
Serve: Stack the mini pancakes and serve warm with syrup, fruit, or your favorite toppings.