Step 1

Preheat the oven to 350°F/175°C. Grease and flour an 8-inch/20cm square cake pan.

Step 2

Make the crumb topping. In a medium bowl, toss together the sugars, cinnamon, and salt. Stir in the melted butter with a fork. Add the flour and stir together until just moist (don’t overmix). Set aside.

Step 3

To make the cake, whisk together the dry ingredients in a large bowl (flour, baking soda, baking powder, salt, and cinnamon). In another medium bowl, whisk together the yogurt, brown sugar, oil, and maple syrup

Step 4

Take 1 apple and finely chop it (or grate it using the largest holes on your box grater). Fold it into the wet ingredients. Take the other apple, and cut it into thin slices. Toss in lemon juice and set aside.

Step 5

Fold the dry ingredients into the wet ingredients until just combined––do not overmix. The batter will be thick. Pour batter into the prepared pan and smooth it out.

Step 6

Line the surface of the cake with the apple slices. Spread the crumb topping on top of the apples.

Step 7

Bake for 50 minutes, or until a toothpick comes out clean. Cool for at least 10 minutes before cutting and serving (serve warm or at room temperature).