In a bowl, whisk the eggs and milk together. In a skillet preheated with oil, scramble the eggs until fully cooked. Remove the eggs and set them aside.
Roll out the puff pastry dough, making it a bit thinner. Cut the dough into equal-sized squares, about 4x4 inches. Top each dough piece with a spoonful of cooked eggs.
Slice ham into thin strips.
Top the eggs with bacon crisps, ham, cheese, and green onions.
Brush the edges with whisked egg and fold over the sides, creating an envelop shape. Place the mini quiches on a baking sheet lined with parchment paper, making sure to leave enough space between each. Brush the tops with whisked egg.
Bake the quiche at 400°F for about 15 minutes or until they turn golden brown. Serve warm and enjoy!