Sauce: heat oil in small skillet on medium heat. Add garlic and cook for 2 minutes.
Add cherry tomatoes and cook for 2 minutes or so.
Reduce heat to low and add cream and fresh basil. Simmer for 15 minutes. Thicken by mixing cornstarch with a bit of water to make a slurry. Add this to the sauce and stir thoroughly.
Fish: Preheat oven to 375. Spray baking pan with Pam or equivalent.
In shallow dish, combine melted butter, garlic powder, and lemon juice. In another shallow dish, combine panko and parmesan.
Dip each filet in butter mixutre and then roll well in panko mixutre. Place filets in a single layer onto baking pan.
Press any remaining panko mixture onto the tops of the filets.