Cook rice noodles (or your favorite noodles) in salted water until al dente (make sure to not overcook them). Drain.
Heat oil in a skillet and sauté garlic and ginger over medium heat for about 1 minute, stirring frequently. Add hot chili pepper, red sweet pepper, the whites of the spring onions, salt, pepper, and smoked paprika. Sauté for about 4 minutes, stirring frequently. Also, stir in tomato paste and Sriracha.
To make the sauce, simply add all sauce ingredients (vegetable broth, dark soy sauce, rice vinegar, maple syrup, cornstarch, sesame oil, and red pepper flakes) to a medium bowl and stir with a whisk.
Pour the sauce into the pan and bring the mixture to a simmer. Let simmer for about 1 minute.
Add the drained noodles and toss to combine with the sauce. Cook for a further 1 minute, taste it and adjust seasonings if needed.
Garnish with the greens of the spring onions and sesame seeds, serve, and enjoy! Store leftovers covered in the fridge for up to 3 days.