S'mores pizza

Dough

• 30 g extra virgin olive oil plus extra to grease
• 220 g lukewarm water
• 1 tsp sugar or malt powder (optional)
• 2 tsp dried instant yeast
• 400 g baker's flour plus extra to dust
• 1 tsp salt
• 180 g milk chocolate broken into pieces
• 2 - 3 plain sweet biscuits crushed
• marshmallows to decorate