Prepare a baking sheet by adding parchment paper to a cookie sheet.
Make the Buttermilk by adding the vinegar to your non-dairy milk and let sit while you are making the dry ingredients.
In a medium bowl, place the flour, sugar, baking powder, salt, and chai spice and blend to combine.
Using cold margarine from the refrigerator or freezer, grate the margarine, and immediately add it into the flour mixture. Using a pastry cutter or using your hands, mix the flour mixture and the margarine until they form small pebbles.
Remove the buttermilk from the refrigerator add the vanilla and slowly add it to the flour and milk mixture until it is combined. Make sure not to overmix your dough.
Transfer the dough to a lightly floured surface and gently form the dough into a ball using more flour on your hands if needed. Gently press down until it forms a flat circle. Use the pastry cutter to make 8 pie-shaped pieces.
Place your scones on the prepared cookie sheet and place them in the refrigerator or freezer to chill for at least 20 minutes. Remove the scones and preheat the oven to 400℉.
Brush the tops of the scones evenly with non-dairy milk or melted dairy-free margarine and bake. This gives the scones a darker color than oat milk. Bake the scones for 20-24 minutes until slightly brown on the edges.
Make the glaze by placing the powdered sugar, vanilla, and maple syrup in a small bowl and mix until the mixture is well combined and silky in texture.
Using a knife, cover the scones with a light glaze. Let sit before serving.