Even if you're 100 years old, you need to know this secret …

Even if you're 100 years old, you need to know this secret to cooking dough!
Ingredients:
milk: 260 ml (8.8 fl oz)
dried yeast: 8 g (0.3 oz)
sugar: 20 g (0.7 oz)
eggs: 2 pc
vegetable oil: 40 ml (1.4 fl oz)
salt: 4 g (0.1 oz)
baking powder: 7 g (0.2 oz)
vinegar: 10 ml (0.3 fl oz)
flour: 350 g (12 oz)
soft butter: 60 g (2.1 oz)
melted butter: 60 g (2.1 oz)
eggs: 1 pc
milk: 10 ml (0.3 fl oz)
poppy seeds: 10 g (0.4 oz)