Vegan 'oviebollen' (oven-baked oliebollen)

I don't know anybody who doesn't eat 'oliebollen' at New Years in the Netherlands! Traditionally, they are deepfried, but in 2016 one of the leading brands of supermarket baking products, Koopmans, introduced a ready-made mix for 'oviebollen', a.k.a oven-baked oliebollen.
Sadly, their mix is not vegan, so I decided to try this method with a from-scratch recipe and the results were surprisingly tasty!

What you need (12 pcs):

• 250g flour
• 250ml tepid water
• pinch of salt
• 20g fresh yeast or 7g dried yeast
• 15g sugar
• 100g raisins, soaked
• oil 
• flour for dusting
• powdered sugar, for serving

Pour the water in a large mixing bowl and add the yeast, stirring to dissolve. Stir in the sugar, then mix in the flour and salt to form a batter. Stir in the raisins. Cover the bowl with a clean, moist cloth and leave to rise in a warm spot for 30-45min.

Pre-heat the oven to 200°C (gas 4 / 190°C fan oven). Grease and dust a muffin pan, then use an ice cream scoop to divide the batter into the holes. Drizzle 1tsp oil over each hole and bake for 20min. Remove the 'oviebollen' from the pan immediately (be careful, hot!) and let them cool slightly on a wire rack. Serve the 'oviebollen' dusted with powdered sugar.