In a mixing bowl, add the garlic powder, onion powder, paprika power, cumin powder, chicken seasoning cubes, thyme and salt to taste. Mix together till well combined. This will serve as the spice mix for the fish and potatoes.
Divide the spice mix into two equal portions and place one portion in a separate mixing bowl.
In one mixing bowl with the spice mix, add the fish pieces, drizzle some oil and ketchup. Mix together to combine ensuring that the fish pieces are fully coated with the marinade.
Place the fish in the fridge and allow it to marinade for at least one hour or overnight.
In the second mixing bowl with the other half of the spice mix, drizzle some oil and ketchup. Mix together to combine.
Then add the potatoes, plantain, carrots, bell peppers and ketchup and mix again, ensuring the vegetables are fully coated with the marinade.
Afterwards, place the chicken and the vegetables in a baking dish.
Then place the baking dish in a 350 degrees pre-heated oven and allow the potato and plantain to bake for 10-15 minutes.
Afterwards, take the pan out and flip the potatoes and plantain to the other side.
Then add the marinated fish and vegetables into the baking dish.
Put the baking dish back in the oven and continue baking for another 15 minutes or until the fish and potatoes are fully cooked.
Serve on a plate with any side sauce of your choice.