Heat wok or large non-stick skillet to medium heat and add 1/2 cup water. Add chicken and sprinkle with salt. Stir thoroughly until chicken is cooked and water is almost dried.
Meanwhile, in medium sized pot combine sugar, peanut butter, soy sauce, water, cooking oil, and garlic. Do not add coconut milk yet. Heat over medium heat until bubbling, stirring occasionally, then reduce heat to medium low. Once peanut butter and sugar has melted completely, slowly add cocnut milk, stirring until dark sauce has become caramel colored. Let sauce simmer over low heat to thicken.
Steam cook spinach leaves AND/OR follow cooking instructions on stirfry veggies package. Instead of adding the sauce that comes with the veggies, add enough prepared peanut sauce to coat veggies and cook together about 5 minutes.
Drain chicken, place it back into skillet, and add prepared peanut sauce to coat over medium heat.
To serve: Make a bed of white rice, then a bed of spinach. Add stirfry, then chicken. Top each serving with leftover peanut sauce and enjoy!