Quick u0026 Easy Rhubarb Sponge Cake

Name: Quick u0026 Easy Rhubarb Sponge Cake
Prep time: 10 min
Cook time: 40 min
Total time: 50 min
Cuisine: European, British
Ingredients: 250g (8.8oz) rhubarb, chopped; 250g (1 cup) soft butter; 100g (3/4 cup) sugar; 1 teaspoon vanilla extract (or packet of vanilla sugar); 1 pinch of salt; 4 eggs (size M); 250g (1 cup) flour; 2 tsp baking powder