I Make Church Chicken Casserole for a Taste of Home

Name: I Make Church Chicken Casserole for a Taste of Home
Ingredients: Nonstick spray; 8 ounces egg noodles, cooked; 1 1/2 pounds boneless, skinless chicken, breasts or thighs, cut into 1/2-inch pieces; 2 teaspoons kosher salt , divided; 3/4 teaspoon ground black pepper , divided; 3 tablespoons vegetable oil , divided; 4 tablespoons unsalted butter , divided; 8 ounces cremini or white mushrooms , sliced; 3 tablespoons all-purpose flour; 1 1/2 cups chicken broth; 1 cup milk; 1/2 teaspoon onion powder; 1/2 teaspoon garlic powder; 8 ounces sour cream; 1 sleeve Ritz Crackers; 2 tablespoons butter , melted