Pat fish fillets dry with paper towels and place in a shallow baking dish or baking sheet lined with parchment paper.
Season fish fillets to taste with salt and pepper and lightly brush with olive oil.
Bake for 9-11 minutes or until the fish is opaque and flakes easily with a fork. The internal temperature should read 145 degrees in the thickest part of the fillet.
While the fish is cooking, melt butter over low heat in a small saucepan. When the butter starts to foam, remove pan from the heat. Grate in garlic and zest of half a lemon. Stir in juice from half a lemon and about half of the chopped fresh herbs.
Thinly slice the other half of the lemon and arrange on a serving platter with more whole fresh herbs. Lay fish fillets on top and drizzle with lemon garlic butter sauce and sprinkle with remaining chopped fresh herbs.
Notes
If walleye isn't available where you live, this very easy recipe will work with any type of mild flaky white fish. Grouper, pollock, sea bass or halibut would also be a perfect choice.