With a dry dishtowel, brush off any dirt that may be on the porcini mushrooms. Cut the mushrooms into thin slices.
Heat the olive oil in a saucepan, and add the garlic and nepitella. When the garlic is golden, add the mushrooms and cook in the saucepan for a few minutes before adding salt, to taste.
Toast the bread and drizzle some olive oil on top.
Remove the nepitella sprigs from the saucepan. Place mushrooms on top of the toasted bread. Serve immediately.
Do not rinse porcini mushrooms under water as they will absorb water like a sponge.