Preheat oven to 350. Place the fish on a piece of foil and onto a sheet pan and rub with evoo. Season with salt, black pepper, cumin and cayenne pepper and bake for about 20 minutes, or until the fish flakes away easily with a fork.
While the fish is cooking, combine the red onion, avocado, lemon juice, cilantro and salt and pepper. Stir gently to combine.
Once the fish is finished cooking, top with 1-2 tsp of the chunky guacamole and enjoy!
Recipe by Keys to the Cucina at https://keystothecucina.com/2015/03/05/30-minute-meal-mackerel-with-chunky-guacamole/