Preheat the oven to 350 degrees F. Spray a mini muffin tin with nonstick spray.
Whisk 3 tablespoons of the sugar, the flour, baking powder, baking soda and salt together in a medium bowl.
In another bowl, whisk the buttermilk, vanilla, orange zest, 2 tablespoons of the melted butter and the egg until just combined.
Add the wet ingredients to the dry ingredients and whisk until just combined.
Fill a madeline tin with batter, or use a mini muffin tray and bake until a toothpick inserted into the center comes out with a few moist crumbs, 10 to 12 minutes.
Cool slightly and then remove from the pan.
Pour the remaining 1 stick melted butter in a small bowl and, in a separate medium bowl, mix together the remaining 1 cup sugar and the cinnamon.
Brush the tops with the melted butter and roll in the cinnamon sugar. Serve warm.