Preheat your oven to 350 F.
Heat the oil in a Dutch Oven or large oven-safe pan over medium heat. Add the sliced onions and cherry tomatoes and cook, stirring occasionally for 5 minutes.
Add the tablespoon of water and the chopped peppers and cook, stirring occasionally for another 5 minutes.
Add the wine, tomato paste, vegetable broth, Calabrian chilis, anchovy extract and bread cubes and cook for another 5 minutes. Keep stirring once in awhile. Season with salt, black pepper, and Aleppo pepper to taste.
Turn the heat off on the stove and tuck the fish pieces into the sauce. Drizzle with olive oil, season the fish to your liking, and top with half the basil. Cook for 12 to 15 minutes depending on the size of your fish pieces.
Remove from the oven and scatter the rest of the basil over the top. Serve with rice, pasta, spaghetti squash, polenta, or sautéed greens.