In a small bowl, mix the breadcrumbs with the salt and spices. Pour the mixture onto a flat plate or shallow bowl and set aside. Cover a large plate or baking sheet with a paper towel and set it aside as well.
Cut the avocado in half lengthwise, remove the pit, peel, and then slice each half into approximately five long slices (approximately 1/2-inch thick). Here's How to Peel and Cut an Avocado.
Coat the bottom of a large skillet generously with the olive oil. Place it over high heat. As the pan heats up, place the avocado slices -- a couple at a time -- into the breadcrumbs. Sprinkle more crumbs on top and then gently press each slice into crumbs, to be sure they stick to the avocado. Then, flip the slice over, and repeat.
Once your pan is hot, add the coated avocado slices, leaving a few inches between them. Do not crowd the pan -- depending on its size, you may need to do this in a two or three batches. You should hear a sizzling sound when you place them in the pan -- if you don't, wait until the pan it hotter. It's important to wait for the sizzle, or the breadcrumbs won't brown properly. Cook until nicely browned, about 1 minute per side.
Remove the avocado slices from the pan and place on the paper towel-lined plate or baking sheet to drain. Serve!