Plum and almond baked oats

Name: Plum and almond baked oats
Ingredients: 2 ripe bananas, mashed (about 200g/7oz); 2 free-range eggs; 250g/9oz Greek-style yoghurt, plus extra to serve; 220ml/8fl oz milk (any type); 2–3 tbsp maple syrup; 1 tsp vanilla extract; ½ tsp almond extract (optional); 150g/5½oz rolled oats; 150g/5½oz oat flour; 60g/2¼oz ground almonds; ½ tbsp baking powder; ½ tsp bicarbonate of soda; ¼ tsp fine salt; 4–5 ripe plums, stones removed, cut into wedges; 4 tbsp flaked almonds; icing sugar, for dusting (optional)