Rehydrate mushrooms by soaking in a bowl of hot water for at least 30 minutes. Drain well through a fine-mesh sieve. Roughly chop and set aside.
Scrub potatoes and cut into 1” pieces (do not peel). Place in a medium to large pot and fill with enough water to cover by one to two inches. Bring to a boil over high heat. Boil for 10-15 mins. Drain, set aside, and keep warm.
While potatoes are boiling, heat butter or ghee in a medium skillet over medium heat. Add black trumpets to the pan and cook, stirring often, until the mushrooms start to pop (about 5 minutes).
Add minced chives and cook for another 1-2 minutes. Add basil, savory, and wine. Stir to combine. Cook until wine has reduced by half. Squeeze lemon into the pan, stir, and then remove from heat.
Add cooked potatoes to the pan. Using a fork, smash potatoes until no large pieces remain. Stir to combine thoroughly with the other ingredients. Serve garnished with additional chives.