Wash hands with warm, soapy water for 20 seconds.
Wash vegetables, then chop and slice them.
Divide fish into 4 portions.
Heat oil in a large skillet.
Add raw fish and onion to the skillet. Sprinkle with salt and pepper.
Cook over medium high heat. Flip fish once the first side begins to turn golden brown.
Add zucchini and bell pepper to the skillet. Continue cooking until the fish is flaky and vegetables are tender crisp. The fish is done when it reaches 145°F on the food thermometer
Sprinkle lemon juice and parsley over cooked fish and vegetables.
Serve with lemon wedges, if desired.