Cook the gnocchi according to package instructions. Drain and set aside.
In a large pan, heat butter or olive oil over medium heat. Add shallots and cook until softened (about 2 minutes). Add mushrooms and cook until golden (5 minutes).
Add garlic and cook for another minute until fragrant.
Build the sauce: Pour in the broth and let it simmer for 1-2 minutes. Stir in the heavy cream, whole grain mustard, salt, and pepper. Let it thicken slightly (2-3 minutes).
Add the cooked gnocchi and Parmesan, stirring gently until coated and heated through.
Garnish with fresh parsley and extra Parmesan. Enjoy!