1-Preheat and Prep: First, preheat your oven to 180°C (350°F) standard or 160°C (320°F) fan-forced and grease and line an 8-inch cake pan with baking or parchment paper.

2-Mix Dry Ingredients: In a bowl, combine the flour, baking powder, baking soda, salt, sugar, and chopped apple briefly.

3-Mix Wet Ingredients: In another bowl, whisk the eggs, vanilla extract, oil, and Greek yogurt until the yolks are broken up.

4-Combine and Bake: Gently mix the wet ingredients into the dry ingredients with a wooden spoon until just combined, avoiding overmixing. Pour the batter into the prepared pan.

5-Prepare Cinnamon Topping and Bake: To prepare the cinnamon topping, mix the sugar, cinnamon, and melted butter until the mixture resembles wet sand, then sprinkle it over the batter. Bake for 30 to 35 minutes or until a skewer inserted into the center comes out clean. Let the cake cool on a wire rack.

6-Glaze the Cake: For the glaze, mix the icing sugar with 1 tablespoon of milk until smooth, adding more milk if the glaze is too thick, then drizzle it over the cooled cake. This step adds a sweet finish that makes the cake even more irresistible.