Pistachio Blondie Ice Cream Sandwiches

Name: Pistachio Blondie Ice Cream Sandwiches
Prep time: 30 min
Cook time: 15 min
Total time: 45 min
Cuisine: American
Ingredients: 1 1/4 cup all-purpose flour; 1 tablespoon malted milk powder (optional (can also use whole milk powder)); 1/2 teaspoon baking powder; 1/2 teaspoon fine sea salt; 1 cup unsalted butter; 1/2 cup sugar; 5 oz white chocolate (finely chopped); 3 large eggs (at room temperature); 1/2 cup lightly packed brown sugar; 1 teaspoon vanilla extract; 1/2 cup chopped pistachios; 2/3 cup sweetened condensed milk; 1/4 cup pistachio butter; 1/2 teaspoon pistachio extract; pinch fine sea salt; green food coloring (optional); 1 1/4 cup heavy whipping cream; 1 tablespoon powdered sugar