In a stovetop pot over medium heat, add the oil.
Once hot, add in the garlic, ginger and green onion. Stir around for 1-2 minutes.
Add in the mushrooms, snow peas and bok choy. Continue to stir every 30 seconds and cook the vegetables for 3-4 minutes.
In a small bowl, whisk together the miso, hot water and vegetable broth cubes until a smooth mixture is formed.
Pour this into the pot on the stove. Stir to combine.
Lastly, add in the cooked udon noodles. Depending on the packaging of your udon noodles, use total 600g of cooked noodles (weighed after cooking).
Stir every minute and allow them to cook for 4-5 minutes.
Remove from the heat.
Pour the soup into three bowls, evenly separating the vegetables and noodles in each. Enjoy hot!