In a bowl whisk flour, sugar, baking powder, baking soda, salt and cinnamon
In another bowl whisk pumpkin purée, milk, egg, melted butter, vanilla, lemon zest, and lemon juice.
Pour wet into dry and stir gently until just mixed (small lumps are fine).
Let batter sit 5 minutes.
Heat a skillet over medium heat, lightly butter/oil it.
Scoop about 2–3 tbsp batter per pancake. Cook 2–3 min until bubbles form and edges look set. Flip and cook 1–2 min more.
Top with maple syrup and a little extra lemon zest if you like.