Use the type of milk you like, and make it completely vegan by using a vegan alternative. If you're gluten free, make sure to use gluten free certified oats.
Make the pumpkin spice oatmeal latte as thick in texture as a pumpkin oatmeal or as runny as a thick pumpkin spice latte or anywhere in between.
If you have ready made granola, you can use that as the crunch topping.
The pumpkin spice oatmeal can be made 3 days in advance, and on the day of serving, brew the espresso and serve right away.
You can skip the frothed milk topping, or make a rather decadent whipped cream one.