Combine all the dry ingredients well using a whisk.
Combine the yogurt and honey and mix well with a whisk or fork.
Add the yogurt mixture to the dry ingredients.
Combine the yogurt and dry ingredients using a fork.
Blend well until a cohesive dough forms.
Transfer dough to a work surface dusted well with tapioca starch.
Making sure your hands are dusted well with tapioca starch, work the dough until a ball forms.
Shape into a flattened disk.
Cut the dough into 8 equal pieces.
Shape each piece of dough into a flattened disk and place on a parchment lined baking sheet.
Using a fork, blend together the egg white and water.
If desired, gently score the top of the buns with a sharp knife, being careful not to insert the knife too far.
Brush each bun with the egg wash, making sure to coat the edges.
Top with sesame seeds or other toppings, if desired.
Bake on an upper rack for 25 minutes.
Transfer buns to a cooling rack and let cool completely before slicing.
Notes
Volume Measurements:
2 cups + ½ teaspoon sorghum flour
1 ⅓ cup + 1 teaspoon tapioca starch
Please note that gluten-free recipes work best with weight measurements because they are more precise than volume measurements. Gluten-free baking requires more precision and can be less forgiving than baking with regular all-purpose wheat flour.
These volume measurements were made from spooning each of the flours into the measuring cups/spoons (so they are not packed) and leveling them off.
The volume measurements are approximate. Make slight adjustments to the recipe as needed, adding a bit more Greek yogurt or a bit more tapioca starch or brown rice flour to achieve the correct dough consistency.
These buns keep for 2 days in a sealed bag. Use a toaster or microwave to warm them and they will soften right up.
Top them with sesame seeds, grated Parmesan, poppy seeds, etc.