Chop the celery and dice the onion. Saut in the butter with pepper, seasoned salt, and garlic. Saut for 12 minutes.
I had the lid pop open on the seasoned salt and poured out a 1/4 cup that went in. So I grated a medium sized potato and added in. This helped tone down the saltiness. Saut the potato with the onion and celery.
Boil the chicken in the salty peppered water. When the chicken is done remove from water, and add the shells. Cook till done but don't throw out the water. Preheat oven 450 Fahrenheit.
Steam the mixed vegetables then chop up the bigger pieces. Chop the chicken and add into the celery onion mixture. Add the flour mixed with ground black pepper to taste.
When the flour is added cook for 8 minutes. Add the pasta shells, and cheese. Add 2-1/2 cups of chicken-pasta water and stir well. Allow to simmer stirring often for 15 minutes add more of the water if necessary. Melt the butter add breadcrumbs and 1/4 cup of chicken-pasta water stir mixing well.
Add the breadcrumbs to top of the casserole. Spread over the top and bake for 35 minutes covered. Remove cover and put under broiler till browned and crispy. Serve after allowing to rest for 15 minutes. I hope you enjoy!!!
