Make this delicious no bake dessert with oats, banana and cocoa

Ingredients:

90 g rolled oats(~ 1 cup)
150 ml hot milk/ plant (2/3 cup)
leave on for 5-10 minutes
1 ripe medium banana
20 g cacao(1/4 cup)
90 g dark chocolate(3.17 oz)
50 ml warm whipping cream(3 1/3 tbsp)
chopped nuts(optional)
refrigerate for 2-3 hours