Season the chicken thighs evenly with sea salt, black pepper, dried thyme, and ground allspice.
Heat the avocado oil in a large skillet over medium-high heat and sear the chicken until golden brown on both sides.
Transfer the seared chicken into the slow cooker basin.
In the same skillet, add the chopped onion, garlic, ginger, carrots, and bell peppers, sautéing for 3-4 minutes until slightly softened.
Stir in the tomato paste and coconut aminos, cooking for another minute to deepen the flavor profile.
Pour in the chicken bone broth, scraping the bottom of the pan to release any browned bits, then pour the entire mixture over the chicken.
Cover and cook on low for 6 hours or high for 3 hours until the chicken is fork-tender.
Serve warm, optionally garnished with fresh herbs for a bright finish.