In a small cup combine warm water with yeast + 1 teaspoon of sugar. Let it set for a couple of minutes until it becomes bubbly and foamy.
Stir in 1 cup of flour with salt, sugar, vanilla, egg, milk, yeast, and 2 tablespoons of melted butter. Mix well then add the rest of the flour and knead the dough until you get a smooth dough ball. Transfer the dough ball to a bowl and cover with plastic wrap. Let it sit for half an hour in a warm place or until it doubles in size.
Turn dough into a lightly floured surface and deflate it a little. Divide dough into small-medium dough balls (I did 32).
In a medium bowl combine the brown sugar with the cinnamon.
Lightly grease a bundt pan with vegetable oil or baking spray.
Dip each dough ball into melted butter, remove with a fork then roll in sugar mixture until it's all coated. Once all balls are coated and are in the bundt pan, cover the pan with plastic wrap or a damp cloth and let rise for 45 minutes or until the dough almost doubles in size.
Preheat the oven to 350°F/180°C.
Bake for 35 minutes in the preheated oven. Allow to cool for 10 minutes before serving.
Notes
Store in an airtight container in the fridge for up to 3 days.