In a medium saucepan, combine granulated sugar, water, pumpkin puree, and pumpkin pie spice.
Place the saucepan over high heat and bring the mixture to a boil, stirring occasionally to help the sugar dissolve.
Once boiling, reduce the heat to medium-low and let the mixture simmer until it has reduced by about half, about 20-25 minutes.
Remove the saucepan from heat. Carefully strain the mixture through a fine mesh sieve or cheesecloth into a container with a tight-fitting lid to remove any solids.
Let the syrup cool to room temperature. Store the syrup in the refrigerator for up to 2 weeks.
To make the latte, pour pumpkin spice syrup and espresso into a large coffee mug.
Add warmed, frothed milk and stir gently to combine.
Top with whipped cream and a sprinkle of pumpkin pie spice. Serve warm and enjoy!