Prepare a baking sheet with either a nonstick liner or parchment paper.
In a small glass container, add vinegar to soy milk and let sit to create the "buttermilk".
Meanwhile, in separate bowl whisk together flour, baking powder, soda, and cinnamon if using.
Drop applesauce into dry mixture and whisk until well-combined, it will be a bit crumbly.
Gently, without over-mixing, pour the soy milk mixture into the dry mixture and stir together with a wooden spoon. Mix just enough to ensure everything is combined, and not a second longer, or the biscuits will lose their fluffy deliciousness.
At this point, you can either gently shape the dough into a round slab on a lightly floured countertop and use a biscuit cutter to cut out perfectly-shaped round biscuits… OR you can use a large spoon to gently "drop" the dough onto the baking sheet, feeling rather satisfied with yourself that you're saving time AND working the dough a little less, making your biscuits even fluffier and more delicious than your imaginary competition.
Important: Make sure your biscuits touch each other on the baking sheet, whether they're perfect circles or rough drops. They need the support of each other to reach their full potential.
Bake for 10-15 minutes or until you see the edges just beginning to turn golden brown in spots.