In a large mixing bowl, combine all-purpose flour, granulated sugar, baking powder, salt, and ground cinnamon. Whisk until no lumps remain.

In a separate bowl, mix milk, egg, melted unsalted butter, and vanilla extract until smooth.

Pour the wet mixture into the dry ingredients and stir gently until just combined, leaving the batter slightly lumpy.

Preheat a non-stick griddle over medium heat and lightly grease with butter or oil.

Pour batter onto the griddle using a measuring cup, leaving space between pancakes. Cook until bubbles form on the surface.

Flip pancakes and cook until golden brown on the other side.

Mix granulated sugar and ground cinnamon in a small bowl for the topping.

Sprinkle the cinnamon sugar mixture over warm pancakes before serving.

Serve immediately with optional toppings like melted butter or chocolate sauce.