Ham and cheese sticks

400 ml warm milk
10 g dry yeast
4 tbsp sugar, heaped
1 tsp salt, level
2 eggs, 1 packet vanillin
1 tsp baking powder
50 ml vegetable oil
50 g butter
4-5 cups of flour (cup = 200 ml)
1 tbsp 9% vinegar
For topping: 30 g butter
3 tbsp flour, 2 tbsp sugar

Bake at 200°C for 25-30 minutes.