Cook pasta in boiling salted water according to package instructions, drain and collect a cup of cooking water.
In the meantime, clean mushrooms. Peel garlic, cut into fine slices and fry in a large coated pan in ½ tbsp. olive oil over medium to high heat for about 1 minute. Add the mushrooms, cut larger specimens into pieces, season with salt and pepper and fry for about 8 minutes until golden brown.
Mix drained pasta and 1 shot of cooking water with the mushrooms, rub in most of the Parmesan cheese and fold in crème légère. Season to taste and enjoy sprinkled with the remaining grated Parmesan.