Stir the yeast and inulin into warm water (40 Celsius / 105 Fahrenheit). Cover with a kitchen towel and leave to proof in a warm place for 5-10 minutes. It should start to bubble and thicken.
Combine the dry ingredients (almond flour, whey protein powder, psyllium husk, baking powder, cinnamon and orange zest/powdered sweetener, if using) in a bowl and set aside.
In a food processor or in a bowl using an electric mixer, whisk the ROOM TEMPERATURE eggs and egg whites, melted butter (make sure it's WARM and not HOT) and the proofed yeast mixture.
Now add the yoghurt and the first half of the flour mix. Blend until combined. Then add the second half of the flour mix. The dough will thicken quickly.
Now stir in the diced prunes.
Line a baking tray with parchment paper (I used a round pie dish). Wet your hands and form 10 dough balls. Place them in your dish, leaving space around each as the buns will rise.
Cover again with a kitchen towel and leave in a warm space for 50-60 minutes until the buns have significantly increased in size.
Towards the end of the 50-60 minutes, preheat the oven to 175 Celsius / 350 Fahrenheit.
Now it's time to make the mixture for the crosses. Mix the coconut flour, water and xanthan gum so you have a soft paste. Fill into a small ziplock bag, snip off one corner and pipe crosses over the buns.
Bake 15 minutes or until the buns start to brown. Then cover loosely with aluminium foil and bake for another 7-10 minutes. Total baking time should be around 22-25 minutes.