Prepare the Oven and Pan:

• Preheat your oven to 350°F (175°C).
• Grease a 9×5-inch loaf pan with non-stick spray or line it with parchment paper for easy removal.

Make the Cinnamon Sugar Mixture:

• In a small bowl, combine the brown sugar and 1 teaspoon of cinnamon. Set aside.

Prepare the Apple Mixture:

• In another bowl, toss the chopped apples with 2 tablespoons of granulated sugar and 1 teaspoon of cinnamon until well coated. Set aside.

Prepare the Batter:

• In a medium-sized bowl, use an electric mixer to beat the softened butter and ⅔ cup of granulated sugar until the mixture is smooth and creamy.
• Add the eggs one at a time, beating well after each addition, then mix in the vanilla extract.
• In a separate bowl, whisk together the flour and baking powder.
• Gradually add the dry ingredients to the creamed butter mixture, mixing until just combined.
• Stir in the milk until the batter is smooth.

Assemble the Bread:

• Pour half of the batter into the prepared loaf pan and spread it evenly.
• Layer half of the apple mixture over the batter.
• Sprinkle half of the cinnamon sugar mixture over the apples.
• Repeat the layers with the remaining batter, apples, and cinnamon sugar mixture.
• Gently swirl through the layers with a knife to create a marbled effect.

Bake:

• Bake in the preheated oven for approximately 60 minutes, or until a toothpick inserted into the center comes out clean.
• If the top starts to brown too quickly, cover it loosely with aluminum foil during the last 15 minutes of baking.

Cool and Glaze:

• Allow the bread to cool in the pan for about 15 minutes, then transfer it to a wire rack to cool completely.
• In a small bowl, mix the powdered sugar with 1–3 tablespoons of milk or cream to achieve your desired glaze consistency.
• Drizzle the glaze over the cooled bread before slicing.