Cook the rice noodles according to package instructions. Drain and set aside.
In a large pan or wok, heat the vegetable oil over medium heat. Add the minced garlic and sliced red chili, sautéing for 1 minute until fragrant.
Increase the heat to medium-high and add the shrimp to the pan. Cook until they turn pink and opaque, about 2-3 minutes. Remove shrimp from the pan and set aside.
In the same pan, add the thinly sliced bell pepper and sauté for another 2 minutes until they begin to soften. Then, add the baby spinach and cook until wilted.
Return the cooked shrimp to the pan and add the cooked noodles. Pour in the soy sauce, fish sauce, lime juice, and brown sugar. Toss everything together to coat evenly and heat through.
Remove from heat, garnish with chopped green onions, fresh cilantro, and sesame seeds. Serve hot.
Notes
Adjust the amount of red chili based on your heat preference.