Line a baking tin with greaseproof paper and set aside.
Pour the lukewarm milk into a bowl and stir in the yeast.
Allow to sit for 5 minutes to ensure the yeast is active.
Add in the flour, egg, butter and sugar and mix until a dough is formed and no dry portions remain in the edges of your bowl.
On a low setting with your mixer, beat for a further 8 minutes until the dough looks smooth, slightly glossy and is pulling away at the sides of your bowl.
Invert the dough into your prepared tin and spread out evenly.
Cover and allow to rise for 1 hour.
Preheat your oven to 180C/350F.
For the filling, place the butter and sugar into a saucepan on low heat, stirring until melted and smooth.
Press indentations all over your dough and evenly spread the sugar mixture over the dough.
Bake in the oven until golden, approximately 20 minutes.
Remove and allow to cool.
Slice and serve warm with your favorite hot beverage.
Dig in!