Add the dry ingredients - flour, sugar, salt, baking powder, vanilla sugar, cocoa powder - to a large bowl. Mix well using a whisk to combine all ingredients.
Melt coconut oil.
Add melted coconut oil and oat milk to the dry ingredients and mix gently using a whisk. Make sure not to over-mix, but also be careful there are no dry pieces left in the batter.
Wash your pears.
Place parchment paper into a long bread pan. You can use clips to keep it in the spot. Just make sure to remove the clips before baking your cake.
Add a few tablespoons of batter to the pan and spread it out. It should be just enough to create a thin layer of batter on the bottom. Place pears on top of that. They'll fall to the side and move as we add more batter but don't worry, we'll fix them up again later.
Now start pouring the batter into the pan. Be careful not to pour over the top of the pears. I like to add batter with a spoon or ladle. It takes more time but I can be a lot more precise this way. However you choose to do it, make sure to pour it into the cracks between pears and spread it out evenly.
Once all the batter is in the pan, adjust the position of the pears so they all look upwards with the stems.
If you were using clips, remove them before placing your pan in the oven. Bake your cake in a preheated oven at 180°C for 55 minutes.
Check on your cake while it's baking because the pears might move again. In the first 30 minutes, the cake will rise which might cause the pears to fall to the side. Simply open the oven, carefully adjust their position and close the oven again. The middle of the cake will remain runny for a while so adjusting will not be too hard.
Once 55 minutes pass, try if the cake is baked by sticking a toothpick into it and pulling it out. If there's batter on the toothpick, you'll have to bake your cake for additional 10 minutes or so. If the toothpick comes out clean, your cake is done.
When the cake is baked, place it on the countertop and leave it in the pan until it cools down. Then take it out and serve. You can sprinkle it with icing sugar if you want.
