Grate the zucchini in a medium bowl, add 1 teaspoon of salt, and set aside for 10-15 minutes to drain excess water.
Remove excess water using a strainer and spoon, or wrap the zucchini in a thin kitchen towel and squeeze tightly.
Preheat the oven to 400 degrees F.
Gather all ingredients (except cheese and sour cream) in a large mixing bowl and stir with a spatula or your hands until combined.
Prepare a 9x13 or slightly smaller baking dish by spraying it with cooking oil. Transfer the mixture into the dish, even out the top with a spatula, and layer sour cream on top.
Bake the chicken zucchini casserole for 35 minutes. Remove from the oven, add the cheese, and bake again for 10 minutes or until the cheese is melted and bubbly.
Garnish with parsley, scallions, or bacon and freshly cracked black pepper. Enjoy!