Preheat your oven to 350°F. Prepare a 9×5-inch loaf pan by spraying it with non-stick spray.

In a large mixing bowl, cream the softened butter and granulated sugar until light and smooth.

Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.

Carefully mix in the flour and baking powder, stirring only until everything is incorporated. Avoid overmixing.

Stir in the Greek yogurt and milk until the batter is smooth. Set aside.

In a separate bowl, combine the diced apples with brown sugar and cinnamon until the apples are well coated.

Mix together the brown sugar-cinnamon mixture in a small bowl and set it aside.

Start layering by adding half of the batter to the prepared loaf pan. Spread evenly.

Add half of the apple mixture on top, followed by half of the cinnamon-sugar blend. Gently swirl with a knife.

Add the remaining batter, then the rest of the apple mixture and cinnamon sugar. Swirl again for a beautiful marbled effect.

Bake for 50 to 60 minutes, checking with a toothpick to ensure it comes out clean from the center.

If the top starts to brown too quickly, loosely cover it with aluminum foil to prevent burning.

Once baked, allow the loaf to cool for at least 30 minutes before adding the glaze.

While it cools, whisk together the powdered sugar, cream, and vanilla extract to make a smooth glaze. Adjust thickness as needed.

Drizzle the glaze generously over the cooled loaf and let it set before slicing.