1. Place potatoes and water in a medium bowl; cover bowl with plastic wrap. Microwave at HIGH 10 minutes or until tender; let cool slightly. Scoop out pulp, discarding skins. Combine sweet potato, milk, 3 tablespoons brown sugar, and salt in a medium bowl; mash with a potato masher to desired consistency.
2. Combine remaining 3 tablespoons brown sugar, butter, pecans, and cinnamon in a small bowl. Sprinkle butter mixture evenly over potato mixture.
for your toddler: Serve a spoonful of the potatoes on a plate or in a small bowl with a spoon. Omit the pecan-butter mixture, if desired.