Step 1

Preheat the oven to 400°F.

Step 2

Heat a large skillet over medium heat. Add 1/4 cup butter and, once it's melted, add the onions. Cook until it's soft and translucent, about 5 minutes. Add the garlic and cook for one minute more. Sprinkle the flour over the onions, cooking for one to two minutes more, stirring occasionally.

Step 3

Whisk in the chicken broth and heavy cream. Bring it to a strong simmer, reduce the heat and cook until it's slightly thickened, stirring occasionally, about five minutes. Stir in the 1/2 tsp salt.

Step 4

Stir in the turkey, cooked noodles, and the frozen peas (you may want to use a large mixing bowl for this). Add more salt and pepper, if desired, to taste. Pour the mixture into a greased 2-quart casserole dish or 13x9 pan.

Step 5

Melt the remaining butter in a microwave-safe bowl. Add the breadcrumbs and parmesan, mix it thoroughly. Sprinkle the breadcrumb mixture over the top of casserole.

Step 6

Bake for 30 minutes or until it's hot and bubbling and the topping is lightly browned.