Preheat the oven to 350°F (175°C).
Prepare the loaf: Remove the gefilte fish loaf from the packaging and allow it to thaw slightly for easier handling.
Sauté the veggies: In a large pan, heat olive oil over medium heat. Add the sliced onions, carrots, and garlic, cooking until soft and fragrant, about 5 minutes.
Add spices: Stir in paprika, salt, and pepper, coating the vegetables evenly.
Assemble the loaf: Place the thawed gefilte fish loaf in a baking dish and surround it with the sautéed vegetable mixture. Add ½ cup of water to keep the dish moist during baking.
Bake the loaf: Cover the dish with aluminum foil and bake for 1 hour. After the first hour, remove the foil and bake for an additional 15-20 minutes, or until the top of the loaf turns golden.
Create spooky decorations: Once baked, let the loaf cool slightly. Use black olives to create "eyes" and red bell pepper strips for a "bloody" look to give the dish a spooky Halloween vibe.
Serve: Slice the loaf and serve with the vegetables on the side for a creepy and delicious Halloween dish!