Cook the rice. Combine the rice and water in a saucepan and cook according to the package directions. Keep covered and warm until ready to serve.
Season the chicken. Place the chicken in a bowl. Add 2 tablespoons of olive oil, turmeric, paprika, and garlic powder. Mix well and let rest for 5–10 minutes.
Sear the chicken. Heat the remaining tablespoon of olive oil in a large skillet over medium-high heat. Arrange the chicken in a single layer and cook for approximately 4–5 minutes per side, or until golden and cooked through. Work in batches if necessary. Transfer to a clean plate.
Cook the aromatics. Reduce the heat to medium. Add the onion to the same skillet and cook for 4–5 minutes, until softened. Add the garlic and cook for 30 seconds.
Add the Tom Yum paste. Stir the Tom Yum paste into the onions and cook for about 30 seconds.
Add the coconut milk. Pour in the coconut milk and stir, scraping up any browned pieces from the bottom of the skillet. Bring to a gentle simmer.
Finish the sauce. In a small bowl, whisk together the fish sauce, maple syrup, and cornstarch until smooth. Pour the mixture into the skillet and simmer for 2–3 minutes, stirring frequently, until the sauce thickens.
Return the chicken. Add the chicken back to the skillet and turn each piece to coat it in the sauce. Simmer for another 2–3 minutes.
Serve. Divide the rice among four plates or bowls. Top with the chicken and coconut Tom Yum sauce. Garnish with cilantro and sliced green chili.