1. Thaw fish, if frozen. Skin fish, if desired. Season fish with salt and pepper; place in lightly greased shallow baking pan. Bake at 400 for 12-15 minutes or until fish flakes when tested with a fork.
2. Meanwhile, in a large skillet, cook the onion and garlic in butter until tender. Stir in flour, dried oregano or basil, and 1/8 tsp salt. Add milk all at once. Cook and stir until slightly thickened and bubbly.
3. Stir in roasted red peppers and tomato paste; heat through. Serve over fish. If desired, garnish with fresh oregano.