Preheat oven to 350°F (175°C) and grease a mini muffin tin.
In a medium bowl, whisk together flour, sugar, baking powder, and salt.
In another bowl, mix milk, egg, melted butter, and vanilla.
Combine the wet and dry ingredients until just mixed—don't over-stir.
Spoon the batter into the muffin tin, filling each cup about 3/4 full.
Bake for 12–15 minutes or until golden and a toothpick comes out clean.
While baking, mix the cinnamon and sugar for coating in a small bowl.
Let the bites cool slightly, then brush with melted butter and roll in the cinnamon sugar.
Serve warm, ideally with hot coffee or your favorite cozy drink.