Preheat oven to 350 degrees F. Add the vinegar to the milk and set aside for 5 minutes.
Mix together the pumpkin puree, maple syrup and oil together in a large bowl. Whisk in the milk mixture.
In a separate medium bowl, whisk together the cornmeal, flour, baking powder, cinnamon, nutmeg, ginger and salt. Add to the milk-pumpkin mixture and stir until just combined.
Fill 3/4 full into lightly greased or paper-lined muffin tins. This will make a little more than 12 muffins.
Bake for 25-30 minutes or until a toothpick comes out clean. Remove promptly from the oven and let cool in the muffin tin for 5 minutes; then transfer to a cooling rack.
Notes
Oat milk browns like dairy milk, which is why I call for it here in this recipe. You can use other non-dairy milks, but the muffins will be paler.