You will need...
4 eggs
80g fine sugar
100g plain flour (sifted)
100g butter (melted)
What you do...
Preheat oven at 160 Degree Celsius.
Melt butter ( I put it in a bowl and then into a pot of simmering water)
Whisk eggs and sugar together till fluffy.
Fold in sifted flour into whisked mixture till flour is well incorporated.
Pour in melted butter (butter should still be warm) and mix well.
Pour into mould 3/4 full (the cake will rise a little during baking)
Bake in oven for 35 minutes.
Reduce temperature to 150 Degree Celsius and bake for 15 minutes.
(Baking time may vary with different oven so you may have to do a few tries to get it right.)
For the small mould...
I halved the ingredients and baked only for 15 minutes at 160 Degree Celsius.