In a heatproof container, whirl the SweetN Low®, espresso, pumpkin, vanilla extract, and pumpkin pie spice using a milk frother or fork. Pour equal amounts into 4 mugs. In a separate container, heat the milk in the microwave. Pour equal amounts of hot milk into each mug and whirl until the latte is topped with foam. Garnish with a pinch of nutmeg. Serve immediately. Tip: make sure to use plain canned pumpkin, not pumpkin pie filling which contains sugar.