In the slow cooker, combine the coconut milk, chopped onion, minced garlic, grated ginger, red curry paste, soy sauce, and fish sauce. Stir well to mix all the ingredients together.
Add the chicken chunks to the slow cooker, making sure they are well coated in the coconut curry mixture.
Season with salt and pepper, adjusting to your taste preferences.
Add the sliced red bell pepper and green beans to the slow cooker on top of the chicken.
Cover and cook on low for 6-7 hours or on high for 3-4 hours, until the chicken is tender and cooked through.
Once cooked, gently stir the curry to combine the vegetables and chicken with the sauce.
Serve over jasmine rice and garnish with fresh cilantro.