Step 1

Preheat the oven to 400° F. Whisk together the non-dairy milk and cider vinegar vigorously, until it's frothy. Stir in the sweet potato puree.

Step 2

Mix the flour, baking powder, baking soda, and salt together. Add the buttery spread and use a pastry cutter to mix it into the flour. The pieces of buttery spread should be so small that they're not really visible by the time you're done. (Alternately, you can use two knives for the cutting.) Stir in the herbs now, if using.

Step 3

Make a well in the center of the flour mixture and add the wet ingredients and the herbs, if using. Fold them in with a spatula, then knead the mixture together quickly with floured hands, until everything is just combined evenly. (Depending on how moist your sweet potato purée is, you may need to add slightly more flour.)

Step 4

Turn the dough out onto a floured surface and flatten it to a rectangle about 1-inch thick. Use a cookie or biscuit cutter to cut it into 6 to 8 biscuits. Place the biscuits onto a parchment lined baking sheet and brush the tops with the tablespoon of melted buttery spread. Bake for 10 to 12 minutes, or until lightly golden on bottom and firm on top. Transfer to wire racks to cool until you're ready to enjoy them.

Step 5

Preheat the oven to 400° F. Whisk together the non-dairy milk and cider vinegar vigorously, until it's frothy. Stir in the sweet potato puree.

Step 6

Mix the flour, baking powder, baking soda, sugar, and salt together. Add the buttery spread and use a pastry cutter to mix it into the flour. The pieces of buttery spread should be so small that they're not really visible by the time you're done. (Alternately, you can use two knives for the cutting.)

Step 7

Make a well in the center of the flour mixture and add the wet ingredients. Fold them in with a spatula, then knead the mixture together quickly with floured hands, until everything is just combined evenly. (Depending on how moist your sweet potato purée is, you may need to add slightly more flour.)

Step 8

Turn the dough out onto a floured surface and flatten it to a rectangle about 1-inch thick. Use a cookie or biscuit cutter to cut it into 6 to 8 biscuits. Place the biscuits onto a parchment lined baking sheet and brush the tops with the tablespoon of melted buttery spread. Bake for 10 to 12 minutes, or until lightly golden on bottom and firm on top. Transfer to wire racks to cool until you're ready to enjoy them.