Saffron and White Chocolate Buns

Name: Saffron and White Chocolate Buns
Cuisine: European
Ingredients: 250ml (1 cup) milk; ½ gram (¼ tsp) saffron; 75g (⅓ cup) butter (chopped into small pieces); 100g (3½ oz) cream cheese; 500-550g (4 cups - 4½ cups) spelt flour (see note 2); ½ teaspoon salt; 75g (⅓ cup) sugar; 7g (2 tsp) dried yeast; 70g (⅓ cup) butter (room temperature); 1 teaspoon vanilla extract; 100g (3½ oz) white chocolate (chopped); 1 egg; pearl sugar (optional)