Preheat your oven to 375-F and spray an 8x8-inch baking dish with nonstick cooking spray. Set aside.
Make the mashed potatoes according to the package directions but add 1 cup less liquid than what is called for.
Mix in the sour cream, cottage cheese, onion powder, garlic powder, chives and 2 tablespoons of butter until well combined.
Transfer the mixture to the prepared baking dish and dot the top with the remaining 1 tablespoon of butter.
Bake in a preheated 375°F oven for about 15-20 minutes. Then, switch the oven to the broiler setting and broil for 2-3 minutes to brown the top.
Serve hot, and enjoy the creamy, savory goodness of this comforting casserole.
