Cook the noodles according to package directions. Drain, rinse, and divide between your bowls.
In a soup pot or Dutch oven, combine the garlic, ginger, water, miso paste, broth cubes, carrots, and mushrooms. Simmer, stirring occasionally, until the miso and broth cubes are totally dissolved and the carrots soften, about 6-8 minutes.
Ladle the broth and veggies over the noodles, then serve with the toppings of your choice on the side, so everyone can build their own bowls!
The trick to making this recipe in 30 minutes is timing. Prep as much as possible while you cook the noodles, and do any remaining prep work while other things simmer.
Calorie information is calculated for the soup only. Toppings will add to the total calories.