Add the baby carrots to a slow cooker. Sprinkle with some salt, cinnamon and brown sugar and mix to combine.
Pour in the maple syrup and distribute by throwing. Scatter the coated carrots to form an even layer in the crockpot. Top with the cubed butter, then close the lid.
Set and cook on high for 3 hours or on low for 5 to 6 hours.
During the final 30 minutes of cooking time, remove the lid, change the heat to high to thicken the glaze. Once the glaze has thickened, transfer the carrots to a large bowl and cover to preserve warmth. Pour the liquid into a saucepan and simmer over medium high heat. Stir while cooking until it thickens for about 5 minutes.