In a small-bowl, whisk together the peanut butter, lime juice, garlic, liquid amino, maple-syrup. Then put aside.
Heat the oil in a large-pan over medium-high-heat. When the oil is warm, then add the onion & cook till translucent for 7-10minutes.
Add the broccoli & cook for 5minutes or till the broccoli is crisp tender. Then add from the sweet-potato noodles & cook, tossing often, till the noodles are still slightly crisp for 5minutes.
Turn the heat to low then add the sriracha and peanut sauce, if using. Toss the sauce with the noodles to coat. If necessary, add water 2 tbsp at a time, till each of the noodles are coated in the sauce.
Serve and enjoy with desired toppings.