Preheat oven to 190°C and grease a mini muffin tray.
Sift together flour, baking powder, salt, and cinnamon. In a separate bowl, mix together vanilla, butter, sugar, egg and milk. Then combine the wet and dry ingredients, mixing until just combined.
Fill 16 mini muffin holes with the mixture until they're level with the muffin tray (approximately 1 tablespoon) and bake for 10 minutes or until cooked through.
Combine cinnamon and sugar in a cup or bowl. While muffins are still warm, brush tops with melted butter and then dust with the cinnamon mixture.