Sour Cream Cookie – 1¼ cups (150 g) all purpose flour – 1 tsp (3 g) apple pie spice – ½ tsp baking powder – ⅛ tsp baking soda – ¼ tsp salt – ¼ cup (57 g) unsalted butter, room temperature – ½ cup (100 g) granulated sugar – ¼ cup (50 g) light brown sugar – 1 large egg (US), room temperature – 1 tsp (5 ml) vanilla extract – ½ cup (120 g) sour cream, room temperature Brown Butter Maple Buttercream Frosting – ½ cup (113 g) softened browned butter – 1½ cups (180 g) powdered sugar – 2 tbsp (30 ml) maple syrup – 1 tsp (5 ml) vanilla extract – 1 tbsp (15 ml) milk, plus more as needed
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