Combine the ground beef with garlic powder, onion powder, oregano, crushed red pepper flakes, sea salt, and freshly cracked pepper to taste. Don't overwork the meat
Make four burger patties of the same size.
Heat a grill pan over medium-high heat and coat with cooking spray.
Add the burger patties and cook for 3 minutes on each side, or until they reach your desired degree of doneness.
Place the burger on the toasted bun slathered with mayonnaise, top with feta cheese, roasted garlic, kalamata olives, pepperoncini, red onion slices, and a tomato slice.
Top with the remaining bun and serve immediately. Enjoy.