Measure out the chicken broth, coconut milk, and fish sauce into a bowl and whisk together—this ensures the fish sauce distributes evenly throughout the soup rather than settling. In a small bowl, combine the red curry paste, minced ginger, garlic powder, and dried thyme. This flavor base will bloom beautifully when it hits the hot broth. Cut the chicken breast into 1-inch chunks and measure out the jasmine rice. I find that doing all your prep work before the slow cooker starts ensures you can simply layer everything in without scrambling.
Pour the combined broth mixture from Step 1 into your slow cooker. Add the chicken chunks and dry rice, then stir in the flavor paste mixture until everything is well combined and the paste is dispersed throughout the liquid. Cover and cook on LOW for 3 hours—this gentle heat allows the rice to soften completely, the chicken to cook through and become tender, and all the flavors to meld beautifully. The soup will develop a creamy, savory character as the rice breaks down slightly into the broth.
Once the rice is tender and the chicken is cooked through, stir in the fresh basil chiffonade and season with lime juice to taste—I typically squeeze one lime wedge into the pot and adjust from there, as the brightness of citrus should enhance rather than overpower the soup. Ladle into bowls and garnish generously with fresh cilantro. Serve with lime wedges on the side so each diner can add more brightness to their bowl if desired.