Combine warm milk and 1 tsp sugar. Mix until the sugar is well dissolved. Add the dry yeast and let it stand for 5-10 minutes until it becomes foamy.
In a large bowl, whisk flour, sugar and salt. Make a well in the center and pour the yeast mixture and vegetable oil. Mix the dough until it forms.
Transfer the dough in a clean flat surface, lightly floured and manually knead the dough for at about 7-8 minutes until smooth. Lightly poke it using your fingers and see if it springs back.
Grease the bowl and put back the dough. Cover with a kitchen towel, place inside a warm area and let it stand for at about 1 ½ hour or until the size is doubled.
Meanwhile, prepare the filling by whisking the breadcrumbs, brown sugar and flour, then add the milk and melted butter. Mix well and set aside.
Gently deflate the dough, roll it into a log. and divide into 12 equal pieces. Roll each piece into a rectangle and flatten it using a rolling pin. Brush melted butter then spread the filling in the middle. Roll up tightly and place it in a tray, make sure the end is at the bottom so it won't open when baking.
Lightly brush each roll with milk, roll it in a bowl with breadcrumbs then cover with a kitchen towel. Let it rise for another 30 minutes. While waiting, pre-heat oven at 150°C or 302°F.
Remove the cover and place the baking tray in the middle of the rack. Bake it for about 25 minutes or until lightly brown.