Blueberry Breakfast Cake

Ingredients: 1 Stick butter, at room temperature 2 tsp Lemon zest 1 cup Sugar 1 Egg 1 tsp Vanilla 2 cups Flour 2 tsp Baking powder 1 tsp Salt 2 cups Fresh blueberries 1/2 cup Buttermilk 1 tbsp Sugar Preparation: Preheat...