Cook the pasta according to package instructions. Drain and set aside.
In a large skillet, melt 3 tablespoons of butter over medium-high heat. Add minced garlic and sliced mushrooms, cooking for 3-5 minutes until browned.
Add chopped chicken to the skillet, stirring to combine. Remove from heat.
In a separate saucepan, melt the remaining 2 tablespoons of butter over medium heat. Whisk in flour to create a roux, then gradually add chicken broth while whisking.
Increase heat to medium-high and bring to a simmer. Cook for 2 minutes, then stir in heavy cream.
Simmer on low heat, stirring constantly, for 8-10 minutes until the sauce thickens. Season with salt and pepper.
In a 9×13 baking dish, layer cooked pasta, then pour chicken and mushroom mixture over the top. Drizzle the sauce evenly over everything.
Sprinkle shredded cheese on top. Bake for about 20 minutes until bubbling and cheese is melted and slightly browned.
Garnish with chopped parsley before serving.
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Notes
Serve with a green salad or garlic bread for a complete meal!