Place the potatoes in a large pot and cover with cold water. Season with salt. Place over high heat and bring to a boil. Cook until fork-tender, about 30 minutes. Drain and mash with a potato masher.
Place the baking sheet in the oven and roast the asparagus for 8 minutes. Remove from the oven and spoon the honey Gorgonzola mixture over the asparagus spears, then top with the chopped walnuts.