Step 4
Prepare the filling: In a large skillet, melt butter on medium heat. Add the onions, carrots, and celery, and cook until the onions are translucent about 10 minutes. Add the flour and cook, stirring, one minute more. Whisk in 2 1/2 cups of the chicken stock. Whisk in the milk. Decrease the heat to low and simmer for 10 minutes, stirring often until thickened and creamy. Add the chicken meat, thyme, sherry, peas, parsley, salt and pepper and stir well. Taste and adjust seasoning if necessary. Divide the warm filling among six 10-ounce ramekins.