First, preheat the oven to 250°F and grease the loaf pan.
Take a bowl. Mix flour, baking soda, cinnamon, and salt there.
Take another bowl. Mix eggs, sugar, butter, and yogurt, thereby whisking.
Fold in the diced apples and mix them with the dry ingredients.
Pour the batter into the loaf pan and then bake for 50 to 55 minutes or until they turn golden brown.