Preheat your oven to 400°F (200°C).
In a large bowl, combine flour, sugar, and salt.
Add cold butter and mix until crumbly.
Stir in milk and vanilla extract until a dough forms.
Roll out the dough into a rectangle on a floured surface.
Cut the dough into triangles.
Place chocolate chips at the base of each triangle.
Roll the triangles from the base to the top to form croissants.
Place croissants on a baking sheet lined with parchment paper.
Brush with egg wash and bake for 20-25 minutes until golden brown.