First, preheat the oven to 200°C or 392°F. (I baked it using the bottom-top and air circulation modes.)
Cut the butter into cubes and melt it in a saucepan. It should not be hot, just lukewarm.
Take out a large mixing bowl. Pour in the xylitol. Add the melted butter and mix with a whisk until fluffy.
Add the whole eggs. Continue whisking with a whisk.
Sprinkle the honey cake with the spice mixture. Mix, then put down the whisk and switch to a wooden spoon for further mixing.
Add the two types of flour, then sprinkle in the baking powder. Pour in the plain yogurt. Stir with a wooden spoon. It should be creamy.
Get out your muffin tin. (I use a silicone mold and place it inside a metal tin.) Use a spoon to fill the silicone molds with the batter. Only fill the molds ¾ full, otherwise the batter will spill over and the tops won't look nice.
Three pieces will remain from the 12-piece mold, so this will be another baking round. Place the filled molds in the oven and bake at 200°C for 20 minutes.
When ready, remove from the oven and leave to cool completely.
I made a cream topping from plain yogurt and tiramisu protein powder, but it's also delicious on its own.