In a large mixing bowl, combine ground chicken, green onions, bell pepper, cilantro, garlic, lime juice, kosher salt, red pepper flakes, and olive oil. Mix gently to combine.

Divide the mixture into four equal portions and form into patties about ¾ inch thick.

Preheat a skillet over medium-high heat and add olive oil, swirling to coat.

Cook the patties for 2.5 to 3 minutes on one side, then flip and cook for an additional 2.5 minutes until cooked through.

In a separate bowl, toss mixed greens with olive oil, lime juice, and kosher salt.

Serve the cooked burgers with the salad and garnish with avocado and tomato slices if desired.