1 Preheat oven to 375. 2 Rinse filets in water, pat dry with paper towels. 3 Set aside 4 Melt butter in a small saucepan. 5 Add garlic, olive oil, stirring until all is mixed together. 6 Spray a small square glass baking dish with cooking spray. 7 Sprinkle both sides of fish with salt and pepper, and lay fish filets in the dish. 8 pour garlic butter mixture over everything. 9 Bake at 375 for 15-20 minutes, until fish flakes when you pick at it with a fork.