In a medium skillet, melt butter to cook the potatoes, carrots and onion for 2-3 minutes.
Stir in corn and peas. Mix corn starch to chicken broth and add to vegetables.
Add crab meat and season with salt and pepper.
In a pie shell or any pan with a rim, place one sheet of puff pastry and pour in vegetable/crab mixture. Cover with a second sheet and bake it at 350 degrees for about 20 minutes (until golden brown).