Preheat oven to 300 degrees Fahrenheit. Line a baking sheet with a silicone mat or lightly grease. Set aside.
Into a large mixing bowl, combine the flours and baking powder together.
Pour the coconut milk over the flour. Stir gently until mixed. Dough should be soft and just firm enough to be shaped.
Shape dough into a ball. If it is too soft and sticky, and sticks to the bowl, add a little more flour. Once formed cover the bowl with a clean dishtowel and let sit at room temperature for one hour.
After an hour, turn the dough onto a large floured surface. Roll dough out gently until about 1/2 inch in thickness. Cut out with a biscuit cutter, reusing dough scraps.
Place 6 buns onto the prepared baking sheet.
Brush tops with plant based milk and gently pressed down sesame seeds.
Cover the baking sheet loosely with tin foil. Bake buns for 10 minutes. Remove from oven and remove tin foil. Return to oven and bake for 2-4 more minutes until firm but soft to the tough with a mealy crumb while sliced.
Remove buns from oven. Place buns on cooling rack.
While still hot, slice in half lengthwise with a bread knife, using a pot holder or cloth to hold buns while slicing. Let cool completely.
Repeat baking with the rest of the dough.
Store cooled buns in the fridge or freeze for later.