Vegan Spicy Peanut Noodle Stir Fry

Name: Vegan Spicy Peanut Noodle Stir Fry
Cuisine: Asian
Ingredients: 6 tbsp soy sauce, or gluten-free tamari sauce; 8 tbsp peanut butter; 1 1/2 tbsp Sriracha sauce; 1 tbsp toasted sesame oil; 250 g wholewheat noodles, or gluten-free soba noodles; 200 g Tenderstem broccoli; 250 g chestnut mushrooms; 1 medium red bell pepper; 2 spring onions; (Optional) A bunch of fresh coriander