Begin by bringing a very large pot of broth or salted water to a boil.
Boil the box of pasta until all liquid is absorbed OR until cooked to al dente, then drain if needed.
Peel the cloves of garlic, but keep them whole.
Peel the carrots and slice them into thin coins or even-sized chunks.
To an oiled sheet pan (or dry roasted is fine), place sliced carrots, diced onion, and garlic cloves with even spacing between each item.
Roast in the oven at 350º F for about 30 minutes, until the garlic cloves are soft.
Add the cooked carrots, onions, and garlic, along with all of the spices, miso paste, milk, yogurt, and nutritional yeast to a high powered blender.
Blend on the highest setting until smooth. Add more liquid if desired.
Pour the sauce onto the cooked pasta and combine gently.
Season well with salt and pepper to taste and serve hot.