In a deep skillet, stir the curry paste into the can of coconut milk over medium heat. Keep stirring to dissolve. Once the curry paste has dissolved, let simmer for 3-5 minutes.
Add brown sugar, lime juice, oyster sauce and peanut butter. Stir.
Add onion, garlic, chicken and vegetables. Stir.
Add 1-2 tbsp water if needed to thin down sauce. Simmer for 20 minutes or until the chicken is fully cooked.
Serve over cooked rice or noodles. Garnish with chopped peanuts.