Leftover Citrus Bars

Name: Leftover Citrus Bars
Prep time: 15 min
Cook time: 1 h 10 min
Total time: 1 h 25 min
Cuisine: American
Ingredients: 12 tablespoons butter, unsalted and at room temperature; ½ cup granulated sugar; 1 ½ cups all-purpose flour; ¼ cup almonds, finely chopped; ½ teaspoon kosher salt; 6 eggs; 2 cups granulated sugar; 1 cup flour; 1 cup assorted citrus juice (grapefruit, lemon, and lime); Zest of all citrus (grapefruit, lemon, and lime); ½ teaspoon kosher salt; 1 teaspoon baking powder; ¼ cup powdered sugar