Sweet breakfast bread

Crumble topping

• 30 g plain flour
• 20 g sugar
• 25 g unsalted butter, cut into pieces

Dough

• 1 egg, plus 1 egg, beaten, for egg wash
• 2 egg yolks
• 100 g unsalted butter, cut into pieces
• 50 g sugar
• 1 tsp vanilla sugar (see Tip)
• 2 tsp dried instant yeast
• 150 g milk
• 500 g plain flour
• 1 tsp sea salt