Wet base: In a large bowl, whisk melted butter and granulated sugar until smooth (~1 min). Add sour cream, eggs, milk, and vanilla. Whisk until fully emulsified and glossy.
Dry blend: In a separate bowl, sift together flour, baking powder, baking soda, and salt. Sifting prevents lumps and ensures even rise.
Combine: Add dry ingredients to wet all at once. Switch to a spatula and fold just until no streaks remain—about 12 strokes. Do not overmix.
Fold in apple: Gently fold in all but 2 Tbsp of the diced apple.
Layer & swirl:
Spread half the batter into pan—smooth gently, but don’t compact.
Sprinkle half of the cinnamon-sugar evenly over surface.
Using a butter knife, zigzag through batter 4–5 times—don’t over-swirl; marbling is key.
Top with remaining batter, spreading gently.
Scatter reserved 2 Tbsp apple over top, then sprinkle remaining cinnamon-sugar. Swirl once more, lightly.
Bake: 50–55 minutes—until a toothpick inserted near center (avoiding apple pockets) comes out with moist crumbs, not wet batter. Top should spring back lightly. Ovens vary: start checking at 45 min.
Cool & glaze: Rest in pan 20 minutes. Lift out using parchment, transfer to wire rack. Whisk glaze ingredients until smooth—thick enough to coat the back of a spoon, thin enough to drizzle. Spoon over warm loaf. Let set 10 minutes before slicing.
Tips for Perfect Gravy
(Note: Gravy isn’t traditional here—but for a decadent brunch pairing, reduce ½ cup apple cider and 1 Tbsp butter by half, then whisk in 1 tsp Dijon. Serve warm alongside slices.)
Serving Suggestions
Warm, with a pat of salted butter melting into the swirls
Alongside sharp cheddar for a Kentucky-style sweet-savory bite
Toasted and topped with Greek yogurt and extra diced apple
As a base for à la mode dessert: warm slice + vanilla bean ice cream + caramel drizzle
Storage & Make-Ahead Tips
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