In a small bowl, combine warm milk and yeast. Allow it to sit for about 5 minutes until frothy.

In a large mixing bowl, combine flour, sugar, salt, and cinnamon. Add in the softened butter, eggs, activated yeast mixture, and vanilla extract. Mix until it forms a soft dough.

Transfer the dough onto a floured surface and knead for about 10 minutes until it’s smooth and elastic.

Place the dough in a greased bowl, cover it with a damp cloth, and allow it to rise in a warm area for about 1 to 1.5 hours, or until it doubles in size.

Punch down the dough to release air, then shape it into a loaf or divide it into small balls for a pull-apart bread style. Place it in a greased loaf pan.

Cover again and let it rise for another 30 minutes.

Preheat your oven to 350°F (175°C).

In a small bowl, mix additional sugar and cinnamon. Brush melted butter over the top of the dough and generously sprinkle the cinnamon sugar mixture over it.

Bake for about 30-35 minutes or until the top is golden brown and the bread sounds hollow when tapped.

Allow to cool in the pan for a few minutes before transferring it to a wire rack. Enjoy your Cinnamon Sugar Donut Sweet Bread warm or at room temperature!