Preheat your oven to 350°F (175°C) and grease a donut pan.

In a large mixing bowl, combine flour, sugar, baking powder, cinnamon, and salt. Stir until well blended.

In another bowl, whisk the eggs, then add milk and melted butter until uniform.

Gently fold the wet mixture into the dry ingredients, being careful not to overmix.

Fill each cavity of the donut pan about two-thirds full with batter.

Bake for 10-12 minutes until golden and springy to the touch.

Cool in the pan for 5 minutes, then transfer to a wire rack and brush with melted butter.

Roll the donuts in the cinnamon sugar mixture while warm for best adhesion.

Serve warm and enjoy!