Ingredients
- Nonstick vegetable oil spray or unsalted butter, room temperature (for pan)
- ½ cup raw walnuts
- 1 cup (200 g) granulated sugar
- ½ cup (1 stick) unsalted butter, room temperature
- 2 large eggs
- ½ cup sour cream
- 2 Tbsp. apple cider vinegar
- 2 tsp. ground cinnamon, divided
- 1½ tsp. Diamond Crystal or ¾ tsp. Morton kosher salt, divided
- 1 tsp. baking powder
- 1 tsp. vanilla bean paste or vanilla extract
- 2¼ cups (281 g) all-purpose flour
- 3 large Honeycrisp or Fuji apples (about 1½ lb.), peeled, cored, cut into ½" pieces
- ½ cup (100 g) dark brown sugar
- Special Equipment: a 9"-diameter springform pan
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