Wash potatoes, and bake for 45 min at 350, until fork can poke to center without resistance. Cool.
While potatoes are baking, chop fresh herbs and ramps pretty fine and put aside.
While potatoes are baking, chop squash into small pieces, and saute for 10 minutes in olive oil, until water has evaporated, and squash has softened and is developing color. Let cool.
Preheat oven to 425
Cut cooled potatoes in half lengthwise, and use spoon to scoop out majority of potato, leaving skin in tack for fillling (see photo). Put potato flesh in bowl.
Add fresh herbs, ramps and cooked squash to bowl with potato and use fork to mash and mix thoroughly.
Add garlic powder, creme fraiche and cheddar and mix thoroughly. Taste and add salt and pepper to taste.
Scoop filling and add to the 4 potato. halves. Fill well, and mound up, using as much as you can. (You will likely have 1/2 cup or so left over to use another way, depending on the size of the potatoes and your filling skills :).
Place in casserole dish or on small sheet pan, sprinkle the grated parmesan on top and bake for about 30 minutes, until you can see browning, with melted cheese and potatoes are clearly well heated.