Heat saucepan half full of water until boiling and add potatoes, boil until tender. Drain and add into a bowl. Add chicken, vegetables, milk and condensed soup and mix together.
Lay out your puff pastry sheet and turn a ramekin upside down and cut with a knife 1/2" larger than that (so it fully covers the top).
Divide the filling mixture into your 4 ramekins and preheat oven to 400F.
Lay each puff pastry circle on top of each ramekin and gently fold on the edges of the dish so it seals shut.
Place on a baking sheet and put into preheated oven for 20-22 minutes or until the top cooks and becomes golden brown. Serve immediately (will be hot).