If making buttermilk: combine 1 cup milk and 2 tbsp fresh lemon juice and set it aside to thicken for 5-7 minutes.
In a large bowl, sift flour, sugar, baking powder, baking soda, salt and cinnamon together.
Whisk the egg, vanilla extract, and melted butter together and add it to the buttermilk. Whisk to fully blend all wet ingredients together.
Add the wet mixture to the dry mixture, and, using a fork, gently stir until just combined* (see note). The batter will be thick and slightly lumpy (lumps are okay!) Using a spatula, gently scrape down the sides of the bowl, leaving no dry flour behind. Note: Do not overmix your batter.
Heat a griddle or cast iron pan until hot but not smoking. Brush the surface with butter and pour on approximately ⅓ cup of batter for each pancake (medium sized).
Cook until bubbles begin to form on the top and you can easily slide your spatula under your pancakes. Flip your pancakes and cook on the other side for a couple more minutes until the underside is golden brown.
Remove your fully cooked pancake and place onto a plate lined with paper towels.
Enjoy with fresh fruit, nuts, maple syrup or even some homemade Nutella!