Preheat oven to 375 degrees.
Remove the skin from the rotisserie chicken, pull the meat from the bones and shred or chop it to the size you prefer. Set aside.
In a large heavy pot or dutch oven, heat oil over medium high. Add onion, carrots, celery, garlic, thyme and salt/pepper. Saute until vegetable begin to soften, about 5 minutes.
Stir in flour and allow to coat vegetables and begin to brown slightly, approximately 1-2 minutes. The roux should be pasty and lump-free.
Slowly add milk, chicken broth, and sherry, stirring constantly. Add bouillon cube. Add chicken and frozen vegetables. Bring to a boil then reduce heat to simmer. Simmer until the filling has thickened, about 5-10 more minutes.
Fill 6-8 ovenproof ramekins. Leaving one empty.
Roll out pie crust to a 1/4 inch thickness - I made them as thin as possible to help cut down on calories from the crust. Using the empty ramekin as your guide, cut out a round to fit the top leaving a 1/4 inch hangover. Lay over the top of each filled ramekin, crimping the edges. Fill the last ramekin and top with last pie crust round.
Brush the crust with heavy cream and make 3-4 small slits on top.
Place on a baking sheet. Bake for 35 minutes or until the crust is lightly browned.