Start by bringing a large pot of salted water to a boil. Cook the rice noodles according to package instructions. Drain and set aside.
In a small bowl, whisk together sriracha, coconut sugar, honey, tamari, and rice vinegar. Mix until smooth and fully combined.
Heat avocado oil in a large skillet over medium heat. Add ground beef and salt, breaking it apart while cooking until browned.
Stir in diced onion, garlic, and red pepper flakes. Cook until fragrant and the onion becomes soft and translucent.
Add broccoli, bell pepper, and water to the skillet. Cook until vegetables are tender but still slightly crisp.
Pour the prepared sauce into the skillet. Stir well and let it simmer for a few minutes until slightly thickened.
Add cooked noodles to the pan and toss until fully coated in sauce. Garnish with green onions and sesame seeds before serving.