Homemade Klondike Bars Recipe

Name: Homemade Klondike Bars Recipe
Total time: 780 min
Yield: 9
Ingredients: For the Filling:; 3 ounces egg whites (from about 3 large eggs; 85g); 3 3/4 ounces sugar (about 1/2 cup; 105g); 1/4 teaspoon (1g) Diamond Crystal kosher salt; for table salt, use about half as much by volume or the same weight; 1/4 teaspoon cream of tartar, or 1/4 ounce lemon juice (about 1 1/2 teaspoons; 7g); 8 ounces heavy cream (about 1 cup; 225g); 2 1/2 ounces milk (about 1/4 cup plus 1 tablespoon; 70g), any percentage will do; 1/8 teaspoon vanilla extract; For the Chocolate Coating:; 7 ounces dark milk chocolate, such as Endangered Species 48%, finely chopped (about 1 cup; about 200g); 3 1/2 ounces refined coconut oil (shy 1/2 cup; about 99g)