Heat 2 tablespoons olive oil in a large skillet or saucepan 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 until fragrant, about 30 seconds.
Add the cubed chicken and cook, stirring occasionally, until the pieces are lightly golden on the outside, about 3 minutes.
Pour in the can of lite coconut milk and add the coconut palm sugar (or honey) and the remaining 1/4 teaspoon salt; stir to combine.
Increase heat to high and bring the mixture almost to a boil, then reduce heat to low and simmer until the chicken is cooked through and the sauce has slightly thickened, about 10 minutes.
Taste and adjust seasoning if desired, then serve the curry over brown rice or your preferred side.