Easy vanilla cake

Name: Easy vanilla cake
Prep time: 20 min
Cook time: 1 h 20 min
Total time: 1 h 40 min
Cuisine: World Cuisine
Ingredients: 250g pack unsalted butter, softened, plus extra for greasing; 250g golden caster sugar; seeds scraped from 1 vanilla pod or 1 tsp vanilla paste; 5 large eggs, cracked into a jug; 85g plain flour; 100g full-fat Greek yogurt (I used Total); 250g self-raising flour; 3 tbsp semi-skimmed milk; 50g golden caster sugar; seeds ½ vanilla pod or ½ tsp vanilla paste