In a high powered blender, combine the green onions, garlic, chile, lime juice, soy sauce, 1/4 cup olive oil, brown sugar, cinnamon, and salt and pepper. Process until fully combined and smooth.
Coat all four chicken breasts generously with the jerk paste. Place in a large ziplock bag and place in the fridge for at least 2 hours, preferably overnight.
When ready to make the dish, preheat oven to 350F and remove chicken from the fridge.
Make your mango salsa by combining all the ingredients in a medium bowl and setting aside.
Heat a large skillet over medium high heat and add the 1 tablespoon olive oil. Swirl to coat the bottom of the skillet.
Add all four chicken breasts into the skillet and cook for 5 minutes on each side, searing but not completely cooking the chicken through.
Remove the skillet from the heat and cover in the mango salsa.
Place in the oven for 15-20 minutes or until the chicken is fully cooked through (no pink)
Garnish with more cilantro and chopped jalapeño if desired.
Enjoy!