Heat 2 tablespoons olive oil in a large skillet over medium-low heat.
Add the sliced white onion and red bell pepper, sprinkle with 1/4 teaspoon of the salt, and sauté, stirring occasionally, until the onion is softened and translucent, about 10 minutes.
Stir in the curry powder, ground turmeric and minced garlic, then add the cubed chicken and cook about 3 minutes, stirring, until the spices are fragrant and the chicken begins to brown.
Pour in the light coconut milk and add the coconut palm sugar (or honey); stir and turn heat to high until the mixture comes almost to a boil.
Reduce heat to a simmer, cover partially if desired, and cook until the chicken is cooked through and sauce has slightly thickened, about 10 minutes.
Taste and adjust seasoning with the remaining 1/4 teaspoon salt if needed; serve hot over brown rice.