- 4 teaspoons extra-virgin olive oil, divided
- 1 medium onion, very thinly sliced
- 1/2 cup dry white wine
- 8 ounces Pacific cod (see Note) or tilapia, cut into serving pieces
- 1 teaspoon chopped fresh thyme
- 1/4 teaspoon kosher salt
- 1/4 teaspoon freshly ground pepper
- 3/4 cup finely chopped whole-wheat country bread
- 1/4 teaspoon paprika
- 1/4 teaspoon garlic powder
- 1/2 cup finely shredded Gruyere or Swiss cheese
- Preheat oven to 400 degrees F.
- Heat 2 teaspoons oil in a medium ovenproof skillet over medium-high heat. Add onion and cook, stirring often, until just starting to soften, 4 to 6 minutes. Add wine, increase heat to high and cook, stirring often, until the wine is slightly reduced, 2 to 4 minutes.
- Place fish on top of the onion and sprinkle with thyme, salt and pepper. Cover the pan tightly with foil; transfer to the oven and bake for 12 minutes.
- Toss the bread with the remaining 2 teaspoons oil, paprika and garlic powder in a small bowl. Uncover the fish; top with the bread mixture and cheese. Bake, uncovered, until the fish is just cooked through, 8 to 10 minutes.