Place the chicken thighs in the bottom of the slow cooker. Add the sliced onion and red bell pepper on top.
In a bowl, whisk together the coconut milk, Thai red curry paste, minced garlic, grated ginger, fish sauce, and brown sugar until smooth.
Pour the coconut curry mixture over the chicken and vegetables. Cover and cook on low for 6 to 7 hours or until the chicken is very tender.
About 30 minutes before serving, cook the jasmine rice according to package directions.
Stir the lime juice into the slow cooker. Taste the sauce and adjust seasoning if needed.
Spoon the rice into bowls. Top with chicken thighs and plenty of the coconut curry sauce. Finish with chopped cilantro and roasted peanuts.