Maine blueberry gateau recipe

Ingredients

• 1 cup all-purpose flour
• 1 teaspoon baking powder
• 1/3 teaspoon salt
• 1/2 cup unsalted butter (room temperature)
• 1 cup sugar
• 2 large eggs
• 2-1/2 cups fresh or frozen Maine blueberries
• 1 teaspoon lemon juice
• Confectioners’ sugar