Pistachio Rose Shortbread Squares

Name: Pistachio-Rose Shortbread Squares
Ingredients: 2 1/4 cups all-purpose flour; 1/4 tsp. baking powder; 1 tsp. kosher salt; 1 1/2 cups powdered sugar; 1 cup (2 sticks) unsalted butter, softened; 1 large egg; 2 Tbsp. rose rooibos tea or other rooibos tea, crushed; 1 tsp. finely grated lemon zest; 1/2 tsp. vanilla extract; 1/2 cup raw pistachios, chopped; 1/4 cup freeze-dried raspberries; 1/4 cup pink or red sanding sugar