Slice green onions & mushrooms. Mince garlic & julienne zucchini. Melt butter in a large saucepan over medium heat.
Add the chicken, mushrooms, zucchini, garlic, half of the green onions & salt & pepper to the saucepan. Cook & stir often, until tender, about 5 minutes. Drain in a colander.
In a bowl, mix together the cheese, sour cream, remaining green onions, beaten eggs, Italian seasoning & red pepper flakes until well combined.
Stir in the chicken/ veg mixture until well coated.
Spray two individual baking dishes (or an 8 x 8-inch baking pan) with non-stick spray.
Pour the chicken/cheese mixture into the two dishes, divided evenly.
Bake 30-35 minutes.
Allow to cool 5 minutes. Top with sliced green onions for garnish if you wish & serve.