Creating Decadent Chocolate Chip Vanilla Custard Brioches can be straightforward if you follow these simple steps:

1. Prepare the Dough: In a large mixing bowl, combine the flour, sugar, salt, and instant yeast.
2. Mix Wet Ingredients: In a separate bowl, whisk together the warmed milk, eggs, and vanilla extract.
3. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, mixing until a dough forms.
4. Knead the Dough: Add the softened butter to the dough, kneading until smooth and elastic (about 10 minutes).
5. First Rise: Place the dough in a greased bowl, cover it with a clean kitchen towel, and let it rise in a warm place for about 1 hour or until doubled in size.
6. Shape the Brioches: After the dough has risen, punch it down and turn it onto a floured surface. Divide it into 12 equal portions.
7. Fill with Custard: Flatten each portion slightly, placing a tablespoon of vanilla custard and a few chocolate chips in the center. Fold the dough over to seal the filling inside.
8. Second Rise: Place the filled brioches seam-side down in a greased baking pan. Cover and let them rise for another 30 minutes.
9. Preheat Oven: While the brioches are rising, preheat your oven to 375°F (190°C).
10. Brush with Egg Wash: Once the brioches have risen, brush the tops with the egg wash for a golden finish.
11. Bake: Bake in the preheated oven for 20-25 minutes or until golden brown and cooked through.
12. Cool: Remove from the oven and allow the brioches to cool in the pan for 10 minutes before transferring them to a wire rack.

Following these steps will lead you to create these incredible brioches effortlessly.