Cook the noodles according to package instructions. Drain and return them to the pot. Add 2 tbsp of butter and salt to the noodles, mixing until well coated. Set aside.
In a large skillet, melt 2 tbsp of butter over medium heat. Season chicken medallions with salt and pepper, then add them to the skillet. Cook for about 5-6 minutes per side or until they are browned and cooked through. Remove the chicken from the skillet and set aside.
In the same skillet, add sliced mushrooms and sauté until they are soft. Pour in the chicken broth and heavy cream, stirring to combine. Cook for about 5 minutes, allowing the sauce to thicken.
Return the chicken to the skillet, coating it with the mushroom sauce. Simmer for an additional 2-3 minutes to heat through.
Serve the chicken medallions on a bed of buttered noodles, drizzling any remaining mushroom sauce over the top. Garnish with fresh parsley if desired.