Chicken Tetrazzini - cooking recipe

Ingredients

12 ounces linguine (I use fresh, garlic-pepper flavored. You can use dried, plain)
5 boneless skinless chicken breasts
8 ounces butter (divided)
3 tablespoons olive oil
1 tablespoon salt
2 teaspoons pepper
1 lb mushroom, fresh sliced
1 1/2 onions, diced
6 garlic cloves, minced
1 teaspoon dried thyme
1 tablespoon fresh thyme (or 1 more teaspoon dried thyme)
2 teaspoons poultry seasoning, divided
1 tablespoon italian seasoning, divided
1 cup dry sherry or 1 cup dry white wine
1/2 cup flour
5 cups half-and-half or 5 cups milk
1 cup chicken broth (I like Swanson Organic in the box, very rich flavor)
1/4 teaspoon ground nutmeg (fresh if poss)
1 cup frozen peas, thawed
1/2 cup flat-leaf Italian parsley
1 cup parmesan cheese, grated
1 cup breadcrumbs

Preparation

Preheat oven to 375. Spray a 9 x 13 baking dish with Pam.
Cook pasta per package directions. Drain and set aside in large bowl.
Cut chicken into bite-sized pieces and sprinkle with salt & pepper.
In a Dutch oven, melt 2 Tbs. butter and 1 Tbs. olive oil over medium/high heat. Saute chicken until light golden. Remove from pan and place in bowl with pasta.
Add another Tbs. of butter/olive oil to pan and saute onions and mushrooms until lightly golden; 10-15 minutes. Reduce heat to medium/low. Add garlic, thyme, 1/2 of the Italian seasoning, and 1/2 of the poultry seasoning. Lightly saute another 2 minutes - don't burn garlic. Deglaze with sherry and reduce until no longer liquidy. Pour over chicken & pasta in bowl.
Melt 3 more Tbs. of butter and remaining olive oil. Add flour and stir constantly for 2 minutes. Whisk in half-and-half, broth, nutmeg, and remaining salt & pepper. Bring to a boil and simmer until thickened; ~5 minutes.
Stir in the peas, parsley, and chicken/mushroom/pasta mixture. Mix well. Pour into 9 x 13 pan.
In a small bowl, combine breadcrumbs, Parmesan, and remaining Italian & poultry seasonings. Sprinkle on top of casserole. Dot top with remaining butter. Bake, uncovered, for ~30 minutes, until golden brown and deeeelicious!