Heat 1 tsp vegetable oil in a pan over medium-high heat.
Add scallops and cook for about 5 minutes until both sides are golden brown. Remove and set aside.
Add shrimp and cook until they turn pink, then remove and set aside.
In the same pan, sauté garlic and fresh red pepper for about 30 seconds until fragrant.
Pour in 30ml chicken broth and stir well.
Add mushrooms and continue stirring.
Toss in zucchini noodles, then add the remaining 30ml chicken broth and black pepper. Stir and cook until the zucchini softens. (For a firmer texture, stir-fry instead of simmering.)
Sprinkle chicken powder (if using) and mix well.
Return the cooked scallops and shrimp to the pan, stirring until everything is heated through.