Preheat oven to 350°F (175°C).
Melt butter in a saucepan. Add lemon juice, salt, pepper, parsley, and garlic. Boil and stir for 10 minutes.
Place cod on baking sheet. Cover with half the sauce. Sprinkle lemon pepper. Cover with foil.
Bake 15-20 minutes until flaky. Drizzle remaining sauce before serving.
