In a large skillet or wok, heat the sesame oil over medium heat. Once hot, add the diced sweet potato and sauté for about 5 minutes, until it starts to soften.
Add the sliced onion and continue to cook for another 3 minutes, stirring occasionally, until the onion becomes translucent.
Toss in the sliced carrots and bell pepper (or zucchini) and stir-fry for about 5 minutes, or until they begin to soften.
Add the minced garlic and ginger to the skillet, stirring well to combine. Cook for an additional 1-2 minutes until fragrant.
Add gochujang, soy sauce, salt and a splash of water and toss to coat everything evenly.
Add the frozen peas and stir well, cooking for another 2-3 minutes until everything is heated through and well combined.
Remove from heat and serve warm, garnished with chopped green onions and sesame seeds.