Bring salted water to boil, cook penne until al dente, reserve 1 cup pasta water
Heat olive oil in large skillet over medium-high heat until shimmering
Add onions, cook 3-4 minutes until softened and fragrant
Add bell peppers, sauté 5-6 minutes until tender-crisp
Add minced garlic, cook 1 minute until aromatic
Add seasoned chicken, cook 6-8 minutes until golden brown
Sprinkle jerk seasoning over everything, toast 30 seconds
Pour in coconut milk and heavy cream, add thyme
Let sauce simmer 3-4 minutes until slightly thickened
Add cooked pasta, toss with sauce, add pasta water if needed
Season with salt and pepper, garnish with green onions