Place 2 cups sweet rice in your rice cooker. Add 2 cups water and stir and let the sweet rice soak for at least 40 minutes (or up to 4 hours).
Do not drain the rice. Add 1/2 cup remaining water, 1 can coconut milk, 1/2 tsp. salt, and 5 Tbsp. brown sugar. Stir this into the rice. Turn on your rice cooker.
When your rice cooker switches off (after 15-20 minutes), let the rice sit at least for 10 minutes.
I just scooped the rice into a bowl and topped with slices of mango!