Ingredients

For the Spiced Swirl (doubled for layered effect):

½ cup (100 g) light brown sugar, lightly packed

1½ tsp ground cinnamon (Ceylon for floral notes, Cassia for bold warmth)

Pinch of freshly grated nutmeg (optional but highly recommended—adds depth)

For the Batter:

½ cup (100 g) granulated sugar

½ cup (113 g) unsalted butter, melted and cooled slightly

½ cup (120 g) full-fat sour cream, room temp

2 large eggs, room temp

2 Tbsp whole milk, room temp

1 tsp pure vanilla extract

1½ cups (190 g) all-purpose flour, spooned and leveled

1 tsp baking powder

½ tsp baking soda

¼ tsp fine sea salt

1 medium Granny Smith apple (~200 g), peeled, cored, diced into ¼-inch cubes (smaller than specified—ensures even distribution and prevents sinking)

For the Glaze:
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