Youtu.be/oMj24avkIKo
Make the dough: Dilute 1 teaspoon of sugar into the warm milk (about 110F/43C). Sprinkle the yeast and let sit for 5 10 minutes until it is bubbly. If it is not bubbly, the yeast is no longer active and unfortunately cannot be used.
In a bowl, combine flour, sugar, and salt. Pour the yeast mixture in. Add the egg and mix well.
Add the melted butter. Mix until it is fully absorbed. Transfer onto a lightly floured surface.
Knead the dough for 10 15 minutes. Round it into a ball once it turns smooth, elastic, and not tacky.
Place the dough ball into a medium bowl and coat it with 1 teaspoon of vegetable oil. Cover the bowl with a damp cloth or a plastic wrap. Let sit for about 1 hour in a warm area until it doubles in size.
Make the filling/topping: Stir together the cinnamon and sugar in a bowl. Set aside.
Shape the dough: Transfer dough onto a work surface. Roll into a -inch (0.6 cm) thick rectangle. Brush with melted butter throughout the surface. Then sprinkle enough cinnamon sugar filling evenly. Keep the leftover mixture as a topping later.
From the long edge, roll the dough until the end to form a log. With a serrated bread knife, slice the log into 12 equal-sized pieces.
Arrange in a lightly greased muffin tray. Cover with a damp cloth or a plastic wrap and let sit for 1 hour in a warm area to rise.
Bake in a preheated oven at 350F (180C) for 20 - 25 minutes or until golden brown. Let cool on a cooling rack.
Remove the sugar bun from the pan. Brush each top and side with melted butter, then sprinkle the cinnamon-sugar mixture to coat it evenly.
