Chocolate home made croissants

The fluffiest chocolate home made croissants that you can make in your own homes. You need lots of friends to share them because from the quantity's that I added lower you will end up with 18 pieces

Ingredients
Dough
500 grams flour
7 grams dry yeast
200 ml warm milk
2 eggs 
100 grams melted butter
5 tbsp vegetable oil
70 grams sugar
1/3 tsp salt

Filling
500 ml milk
150 grams sugar
vanilla extract
2 egg yolks
100 grams butter
50 grams corn starch
100 grams dark chocolate