Potato buns

Ingredients

• • 1 large potato (=200g / 7 oz), boiled & mashed
• • 2 eggs
• • 1/2 cup Greek yogurt (120g)
• • 1/2 tsp baking powder
• • Pinch of salt
• • 1 egg yolk (for brushing)
• • 1 tbsp sesame seeds