Step 1

Preheat the oven to 400 degrees F.

Step 2

Spray a 9x13-inch baking dish with cooking spray.

Step 3

In a large bowl, stir together the potatoes, the broccoli, the ham, 2 of the sliced green onions, the sour cream, the cream of mushroom soup, 1 1/2 cups of the cheese, the water, the dill, the salt, and the pepper.

Step 4

Pour the mixture into the prepared pan.

Step 5

Cover the baking dish with foil and bake for 1 hour.

Step 6

Uncover and sprinkle the remaining cheese on top.

Step 7

Bake until the cheese has melted, about 15 minutes.

Step 8

Let the casserole stand for 10 minutes.

Step 9

Serve garnished with the extra green onions.