Toasted Marshmallow Protein Cake

Sticking with all things pink & girly I thought i'd see what else I could create using my donut mix as a base recipe.
This cake is packed full of melted marshmallow & is super squidgy & gooey. The best bit is it's less than 90 calories a piece too!
Servings: Makes 6 pieces
Macros per piece:
89kcal / 8g protein / 7.5g carbs / 2.3g fat / 2.5g fibre
Ingredients:
40g coconut flour (I used one by Tiana from Holland & Barratt but this is also available in the baking aisle in large Tesco/Sainsbury/Waitrose stores).
25g vanilla protein powder
60g Apple Sauce (I used Waitrose Essential Bramley Apple Sauce)
80g egg whites
1 whole egg
1/2 tsp baking powder
50ml semi skimmed milk (or other milk of choice)
1/2 tsp natural pink food colouring
40g marshmallows of choice (I used heart shape ones to make the cake look "prettier")
10g Choc Shot (available in hot chocolate aisle of supermarket)