Line a small baking pan with foil. Preheat the oven to 400 degrees. Lightly spray or oil the foil and place the crab cakes on the the pan.
Bake for 21-25 minutes, flipping about 15 minutes in, until golden brown.
Meanwhile, prepare your mango avocado "salsa". Place the diced mango, avocado and red onion in a medium bowl. Drizzle fresh lime juice over the top and add salt. Toss gently to coat and set aside.
When the crab cakes are ready, assemble the salad. Arrange a bed of arugula on a plate. Top with the mango avocado mixture. Place warm crab cakes on top.
Serve with extra limes if desired, or drizzle with your favorite dressing or vinaigrette.