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Ingredients
  • subheading: For the brown-sugar-cinnamon swirl:
  • ½ cup (110 grams) light brown sugar, packed
  • 2 teaspoons (4 grams) cinnamon
  • subheading: For the cake:
  • 8 tablespoons (1 stick; 113 grams) unsalted butter
  • 1 ½ cups (300 grams) granulated sugar
  • ¼ cup (56 grams) sunflower or grapeseed oil (I used canola oil)
  • 2 large eggs, at room temperature
  • 1 cup (240 grams) buttermilk, shaken and room temperature
  • ½ cup (120 grams) sour cream, room temperature
  • 2 teaspoons (8 grams) vanilla paste or real vanilla extract
  • 2 teaspoons (10 grams) baking powder
  • 1 teaspoon (5 grams) baking soda
  • 1 teaspoon (6 grams) fine sea salt
  • 2 ⅔ cups (360 grams) all-purpose flour
  • subheading: For the cinnamon spice frosting:
  • 12 tablespoons (1 ½ sticks; 170 grams) unsalted butter, room temperature, cut into 12 pieces
  • 3 ¾ cups (450 grams) confectioners’ sugar, sifted
  • 3 tablespoons (45 grams) buttermilk, shaken and room temperature
  • 1 ½ teaspoons (3 grams) cinnamon
  • 1 teaspoon white vinegar (optional; see above)
  • 1 teaspoon (4 grams) vanilla paste or real vanilla extract
Steps
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