Method:

Combine yeast together with two cups of warm milk and one tablespoon of sugar. Set aside for about 10 minutes.
Add eggs, mayonnaise, salt and sugar into the mixture, whisking together to combine.
Mix in flour in small portions. Once the flour is all mixed in, add oil to the mixture. It’s important to add oil last, as the texture of the dough turns out better. Knead the dough until it’s elastic, at least for 10 minutes. Let the dough rise for about an hour
Cut the dough into 30 equal pieces. Shape each piece into a flattened ball. Place them next to each other, leaving enough space for it to rise.
Cover with a towel and let the buns rise for about 30 minutes. Press each bun in the center with a glass or cup to form a hollow.
Whisk cream cheese, custard, egg and sugar together, for filling. Fill each hollow with a filling. Dollop with jam
Bake in preheated oven at 180C for about 30 minutes or until golden brown.