Brown rice, cooked according to package instructions (optional)
Cilantro, for garnish
Salted peanuts, for garnish
Grease slow cooker with nonstick cooking spray. Add onion, garlic, chicken, tomatoes, red curry paste, peanut butter, brown sugar, ginger, coconut milk, fish sauce, and soy sauce to slow cooker.
Stir to combine. Cover and cook on high for 4 hours or low for 8 hours. Uncover and stir in chickpeas, potatoes, carrots, and lime juice. Taste and add lime juice and salt, to taste, if necessary.
Serve on top of brown rice, if desired, and garnish with cilantro and peanuts.