Step 1

Stir together all ingredients in a bowl.

Step 2

Melt the butter in a medium saucepan over medium heat. Once melted, whisk in the flour and cook 1 minute, whisking constantly.

Step 3

Whisk in the milk, chicken broth, dried minced onions, salt, garlic powder, and black pepper, and bring to a boil. Let it boil until thickened, about 1 to 2 minutes, stirring constantly.

Step 4

Whisk in the cream cheese until fully incorporated. Remove from the heat.

Step 5

Preheat the oven to 375F. Spray the inside of a 9 by 9-inch baking dish (or another oven-safe dish with an equivalent capacity) with olive oil cooking spray.

Step 6

Add the chicken, mozzarella, cottage cheese, sour cream, scallion, and sauce to a large bowl and mix to combine.

Step 7

Pour the filling into the prepared baking dish and spread it out.

Step 8

Sprinkle the Ritz mixture evenly on top of the filling.

Step 9

Bake uncovered until the casserole is golden on top and bubbling, about 20 minutes.

Step 10

Serve warm garnished with minced parsley.