Begin by slicing your mushrooms.
Place your frying pan on medium heat and add in your mushrooms, dry-frying them for 5 minutes or until they're golden.
Add in your butter, garlic, and miso paste. Give everything a good stir and fry for a minute or two.
Pour in your single cream and leave to simmer on low heat.
Place your udon noodles in a bowl of boiling water and gently loosen them with some chopsticks. Once soft, strain and add into your saucy frying pan. Stir until the noodles are coated in your sauce, then serve up with a sprinkling of spring onions, and enjoy!