This dish is pretty spicy and that's coming from my habanero-loving husband. If you're a fan of more mild flavors, start with 1 serrano chili and 1 tablespoon chili powder. You can always taste test along the way and add more heat. Same thing goes for the Thai basil leaves. If you're not a fan of their strong flavor, start with ¼ cup. If you're using regular basil, you can start with ½ cup because it's not as strong.