Blitz-and-bake beetroot & chocolate cake

INGREDIENTS

• 1 large cooked beetroot , about 175g in weight, roughly chopped
• 200g plain flour
• 100g cocoa powder
• 1 tbsp baking powder
• 250g golden caster sugar
• 3 eggs
• 2 tsp vanilla extract
• 200ml sunflower oil
• 100g dark chocolate , (not too bitter), chopped into pieces
• crème fraîche or clotted cream, to serve