Habshy Halwa with less then 5 ingredients

Name: Habshy Halwa with less then 5 ingredients recipe by Raihana Remtulla at BetterButter
Prep time: 10 min
Cook time: 90 min
Total time: 100 min
Yield: 24
Ingredients: 1/4th cup butter or 1 stick; 2 cups of powdered milk; 1 cup sugar; 2 cups chopped walnuts (reserve 1/2 of it for garnishing); 2 cups half and half; 1 tsp crushed cardamom powder; A pinch of salt