Galaxy Mirror Glazed 'Box' Cake Recipe by Tasty

Name: Galaxy Mirror Glazed 'Box' Cake Recipe by Tasty
Prep time: 2 h
Cook time: 30 min
Total time: 2 h 30 min
Cuisine: American
Ingredients: 2 chocolate cake mixes, 2 boxes, prepared according to package; 2 cups butter, softened; 2 teaspoons vanilla; 1 tablespoon milk; 6 cups powdered sugar; 1 ¼ cups water; 1 ½ cups sugar; 15 oz sweetened condensed milk, 1 can; 15 sheets gelatin; 26 oz white chocolate, chopped, over 30% cocoa butter; black food coloring; navy blue food coloring; light blue food coloring; purple food coloring; pink food coloring; white food coloring