Peanut butter and jam doughnuts

Name: Peanut butter and jam doughnuts
Prep time: 40 min
Cook time: 2 h 40 min
Total time: 2 h 40 min
Yield: 12 portions
Ingredients: oil; 140 g full cream milk; 1 tbsp caster sugar; 2 tsp dried instant yeast; 270 g baker's flour; 30 g salted butter; ½ tsp ground cinnamon; 1 tsp salt; 1 egg; 120 g strawberry jam; 500 g water; 50 g roasted salted peanuts; 100 g dark chocolate; 80 g icing sugar; 20 g full cream milk; 150 g smooth peanut butter; ½ tsp natural vanilla extract; cinnamon sugar