1-First, preheat your oven to 350°F (175°C) and grease an 8 x 4-inch loaf pan or line it with parchment paper for easy removal. This step sets the stage for a loaf that bakes evenly and comes out without sticking, just like grandma used to do.

2-In a bowl, toss the diced apple with the brown sugar and cinnamon; let it stand for 15 minutes to draw out those juicy flavors. Meanwhile, in a small bowl, whisk together the flour, baking powder, and salt to ensure they blend well. Picture this as your base, building layers of taste that make the bread special.

3-Next, in a larger bowl, beat the granulated sugar and softened butter until light and fluffy, then add the eggs one at a time, followed by the milk and vanilla extract. Gently fold the dry ingredients into the wet mixture just until combined don’t worry about a few lumps, as that keeps the texture light. Spoon half the batter into the pan, scatter half the apple mixture on top, add the remaining batter, and finish with the rest of the apples.

4-Use a knife to swirl the apples through the batter in a serpentine pattern for that eye-catching marbled look. Bake for 55-60 minutes, or until a toothpick inserted near the center comes out clean. Once done, cool in the pan for 10 minutes, then turn out to cool completely before whisking together the sour cream, vanilla, powdered sugar, and a bit of milk for the glaze. Drizzle it over the cooled bread and slice it up for a treat that feels like a hug in bread form.