Step 1

Preheat oven to 400°F (204.4 C). Line a baking sheet with aluminum foil. Spray foil generously with non-stick baking spray.

Step 2

Pat mahi mahi fillets dry using paper towels to absorb excess moisture. Season fish lightly on both sides with salt/pepper.

Step 3

Cut large lemon into 6 round slices. Place 2 slices together (for each piece of fish) on the aluminum foil. Place each piece of fish on top of 2 lemon slices.

Step 4

Bake at 400° F. (204.4°C.) for 10-15 minutes. **Time to fully cook depends on thickness of fillets. A "general rule" is fish should cook 10 minutes per inch of thickness. Fully cooked mahi mahi should have internal temperature between 137°F - 145°F. Use meat thermometer, so fish isn't undercooked OR overcooked. Fish should be slightly browned on top, and flake easily with a fork.

Step 5

Make Browned Butter Sauce While Fish Bakes: Melt butter in medium saucepan on Medium-Low heat. Cook 3-4 minutes, stirring often, until bubbly and browned; butter will turn brown as the milk solids separate. Stir in garlic; continue cooking for 30 seconds. Remove pan from heat; add lemon juice and parsley (fresh or dried). Stir until combined.

Step 6

To Serve: Remove fish from oven; Use spatula to transfer mahi mahi (keeping lemon slices underneath) to serving plates. Spoon butter sauce over each piece. Garnish with fresh parsley, if desired. Serve immediately.