Combine the salt, black pepper, and Chinese five-spice powder in a small bowl. Mix it well and set it aside. Marinade the prawns with salt, white pepper, corn starch, and water. Mix it well and set it aside.
Dredge and coat each marinated prawns in the corn starch and gently toss the excess flour out before frying.
Fill the medium size frying pot with vegetable oil at least 2-3 inches high. Heat the oil to high heat about 350° F. Fry the coated prawns in the hot oil for 2-3 minutes until the prawns are crispy golden brown. Remove from oil and place it over the cooling rack.
Heat the large wok/pan over medium heat, drizzle oil, and saute the onions and garlic.
Next add bell peppers, cook for a few seconds and follow with the crushed chilies.
Place the fried prawns in the pan and sprinkle the salt and pepper seasoning powder mix. Finish with spring onions.
Toss everything well for a minute and is ready to enjoy! Serve immediately.