Preheat the oven to 400 and lightly grease a rimmed baking sheet.
Place cod fillet on the sheet and season it with some salt and pepper.
Cut off white ends of asparagus and cut the springs in half. Cut tomatoes in half as well.
Spread asparagus and tomatoes around the cod.
Melt butter and mix in parsley, lemon, and garlic powder.
Pour the butter mixture over cod and some over veggies.
Bake cod and veggies for 18-22 minutes (depending on the thickness of cod.)