Chaat Masala Potatoes and Shallots

Ingredients

• 750g baby new potatoes, cut lengthways into 1cm thick slices
• 2 tbsp olive oil
• 1 tsp chaat masala
• ½ tsp ground turmeric
• Salt and pepper, to taste
• 250g thick Greek yoghurt
• 1 echalion, thinly sliced on a mandolin or by hand
• 1 green chilli ,thinly sliced
• 1½ tsp coriander seeds, toasted
• 1½ tsp nigella seeds, toasted