This is based on a recipe my friend Amanda gave me recently, only I've changed it up so I can make a really big batch and keep it in the fridge to add to my coffee in the morning without hauling out the blender every day. I make a small (6-oz) cup of double-strong coffee, pour it in my big (16oz?) Lone Ranger mug, and then add about a cup of this. If it's not sweet enough for you, you could add some sweetener to taste.
Spiced Pumpkin Latte Mix
4 cups milk (you can use almond milk or soy milk -- I use vanilla almond milk for extra flavor)
1 cup pumpkin puree (I use canned pumpkin -- pumpkin pie mix would give extra flavor)
1/4 cup maple syrup
2 tsp pumpkin pie spice (or a blend of cinnamon, nutmeg, ginger, and cloves)
2 tsp vanilla extract
Pour it all in your blender and blend it until thoroughly mixed. Taste. Add more of whatever you think it lacks. Pour in pitcher and keep in fridge until you're ready to use.