Treats Without Wheat | Lemon Shortbread Cookies

Ingredients

• 4 cups gluten free all-purpose flour mix spooned and leveled
• 1 tsp baking powder
• 3/4 tsp coarse salt
• 1 1/4 cups (2 1/2 sticks) cold unsalted butter, cut into 1/2-inch pieces
• 3/4 cup sugar
• 1 large egg plus 1 large egg white, lightly beaten
• 2 tsp finely grated lemon zest
• 1 cup icing sugar
• 1 tbsp plus 1/4 tsp meringue powder
• 2 tbsp of lemon juice (more or less may be needed for the correct consistency)