1) Add the butter to a skillet over medium heat. Once it melts, let it cook for about a minute.
2) Add the sage to the pan, and let it cook for a minute or so, stirring often.
3) Add the garlic, white wine, Dijon mustard, and cream to the skillet. Give it a good stir/whisk..
4) Add the uncooked gnocchi to the sauce and then cook, uncovered, stirring occasionally, for 6-8 minutes, or until the gnocchi has softened and the starch released has thickened up the sauce to your liking. You may need to turn down the heat a bit if it's bubbling too much.
5) Take the pan off the heat and stir in the parmesan and season with salt & pepper as needed.
Notes
1) Substitute heavy whipping cream for a mixture of creme frâiche and evaporated milk.
2) Add chicken or pork for greater protein.
3) If using homemade gnocchi, boil them first before adding to the sauce.
4) Consider adding chopped sweet peppers, sun dried tomatoes, mushrooms, and/or spinach for greater vegetable content.