1. In a bowl, combine all of the sauce ingredients and whisk until combined.
2. Prepare the noodles according to the packaging instructions. Undercook the noodles by 2 minutes, as they will finish cooking in the sauce.
3. Heat the avocado oil over medium-high heat. Add the onion and garlic and cook until fragrant, about 3 minutes. Add the broccoli, pepper, mushrooms, and snap peas, and saute for 4 minutes.
4. Add the sauce and bring to a simmer, then stir in the prepared noodles. Cook for 2-3 minutes, stirring until the noodles are fully cooked and the sauce has thickened.
5. Garnish with green onions.