Ranch Chicken Stuffed Shells

Ingredients
24 uncooked large pasta shells
2 cups cooked chicken, shredded
1 cup frozen spinach, thawed and chopped
1 cup shredded cheddar cheese
1/2 cup diced green onion
1/4 cup breadcrumbs, optional
cooked bacon pieces, optional
For the sauce:
1/4 cup butter
1/4 cup flour
1 cup shredded Parmesan cheese
1 cup whole milk
1 (1oz) Ranch seasoning mix

Instructions:
Preheat your oven to 350 degrees. Mist a 9×13 pan with cooking spray and set aside.
Cook the pasta shells aldente according to the package directions.
While the pasta is cooking, prepare the sauce.
For the sauce:
Melt the butter in a medium saucepan. Whisk in the flour until a paste is formed. Cook 1-2 minutes, stirring frequently.
Whisk in the milk. Cook on low heat until just slightly thickened. remove from the heat and stir in the Parmesan cheese. until melted. Stir in ranch packet.
Building the shells:
Combine the shredded chicken, spinach, cheddar cheese, green onion, and 1/2 cup of sauce in a medium bowl. Fill each pasta shell with a heaping tablespoon of the chicken mixture and place in your 9×13 pan.
Pour remaining sauce evenly over shells. Sprinkle with breadcrumbs and bacon if using, cover, and bake 25-30 minutes or until heated through. Remove cover and cook an additional 5-10 minutes or until bubbly.