1. Toast hamburger bun in a skillet with olive oil on medium heat. Slather ketchup and mustard on bun and put on a plate.
2. Sauté onions in olive oil on medium heat. Cut tomato, avocado, and pickle while the onion is cooking. Place cut ingredients as well as the onions on the plate off to the side.
3. Cook burger in the skillet with olive oil on medium heat. Season with salt, black pepper, oregano, parsley and garlic powder on both sides. Cook until browned on both sides.
4. Place burger on bun. Put some lettuce on top. Put tomato slice, onions, avocado and pickle on top of the lettuce.