Preheat your oven to 350°F (175°C). Grease and flour a 9×5-inch loaf pan or line it with parchment paper.
Prepare the Dry Ingredients:
In a medium bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, nutmeg, and allspice. Set aside.
Prepare the Wet Ingredients:
In a large bowl, cream the softened butter and sugar together until light and fluffy, about 2-3 minutes.
Add the eggs, one at a time, beating well after each addition. Stir in the vanilla extract.
Combine Wet and Dry Ingredients:
Gradually add the dry ingredients to the wet mixture, mixing until just combined. Do not overmix.
Fold in the sour cream or Greek yogurt until fully incorporated.
Gently fold in the chopped apples.
Prepare the Cinnamon Sugar Topping:
In a small bowl, mix together the sugar and cinnamon for the topping.
Assemble the Bread:
Pour half of the batter into the prepared loaf pan and spread it out evenly.
Sprinkle half of the cinnamon sugar mixture over the batter.
Pour the remaining batter over the cinnamon sugar layer and spread it out evenly.
Sprinkle the remaining cinnamon sugar mixture on top.
Bake the Bread:
