For conventional oven baking, preheat oven to 350°F/180°C. For steam oven baking, preheat to Combi Steam, 350°F/180°C, 30% (low) humidity. Grease and line a 9x5 inch (23x13cm) loaf pan with parchment paper and set aside.
Whisk the melted butter with the eggs and yoghurt.
1 stick butter, 2 eggs, 1/3 cup Greek yoghurt
In a separate bowl, whisk together the sugar, flour, baking soda, cinnamon and ginger. Pour in the wet mixture and stir until it’s almost (but not quite!) combined. Stop when there are a few streaks of flour and a few lumps left.
¾ cup brown sugar, 1 ½ cups all-purpose flour, 1 1/2 tsp baking soda, 1 tsp cinnamon, 1 tsp ground ginger
Add the diced apple and nuts and fold through. Make sure the mixture is fully combined with no streaks of flour, but don't overmix it.
2 apples, 2/3 cup chopped walnuts
Pour into the lined pan, smooth the top and bake until the loaf is deep golden brown and cooked through. In a conventional oven this will take about 55 minutes, in a steam oven it'll be about 45 minutes. Be guided by doneness rather than time; it needs to test clean with just a few crumbs attached when a skewer is inserted into the center.
Leave the loaf to cool in the pan for 15 minutes before turning out onto a rack to cool completely.