Boil a large pot of water on the stove. Add Pasta and cook for 8 -10 minutes until soft. Drain and set aside. Add salt and a little olive oil to prevent sticking.
Heat up a pan on the stove. Add butter and mushrooms. Fry until mushroom juices have evaporated and mushrooms begin to brown. Add cream, mustard and salt and pepper. Allow to simmer for 5 minutes until cream has reduced and sauce thickens.
Remove from heat and stir through pasta.
OPTIONAL: We add chilli flakes or peppercorns for a little hot kick.