Buttermilk Blueberry Breakfast Cake

Ingredients

•  ½ cup unsalted butter, room temperature
• 2 tsp. lemon zest or more — zest from 1 large lemon
• 7/8 cup* + 1 tablespoon sugar**
• 1 egg, room temperature
• 1 tsp. vanilla
• 2 cups flour
• 2 tsp. baking powder
• 1 tsp. kosher salt
• 2 cups fresh blueberries
• ½ cup buttermilk
• * 7/8 cup = 3/4 cup + 2 tablespoons
• ** This 1 tablespoon is for sprinkling on top

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