The Best Greek Burger (Gyro Burger)

Ingredients

• 2 tablespoons olive oil
• 1 egg
• 1 teaspoon salt
• ½ teaspoon pepper
• ¼ cup crumbled feta cheese
• 1 pound ground lamb
• ¼ cup red onion
• 1 teaspoon garlic ((minced))
• ¼ cup bell pepper
• 1 teaspoon rosemary ((dried))
• 1 teaspoon oregano ((dried))
• ½ teaspoon ground marjoram
• optional toppings: tzatziki sauce ((lettuce, tomato, red onion, diced kalamata olives, and more feta.))