Place in a pot of boiling water, boil for 20 minutes, or until they reach a suitable texture.
As the noodles are boiling, prepare your vegetables:
Thinly slice the onion. Slice pepper into thin strips. Slice Zucchini into ¼" slices, then cut them in half. Cut broccoli up into small florets. Thinly slice the carrot, slice the mushrooms into ¼" slices. Set vegetables aside.
In a small bowl, mix the shredded cheese with the xanthan gum. Make sure the xanthan gum is well distributed over the cheese shreds, set aside.
In a medium sauce pan, melt butter. Add heavy cream, bring just up to a simmer.
Add cheese to the heavy cream, continue stirring until cheese is melted and sauce is smooth. Season with salt and pepper to taste, reduce heat to low.
In a large fry pan or wok, cook chicken in olive oil until browned on all sides. Add onion and garlic, continue cooking until onion goes translucent and chicken is cooked.
Add rest of vegetables, saute JUST until warm. You don't want them to actually cook through or go soft.
Strain Palmini pasta, gently toss with sauce and vegetables, serve immediately.