Step 1

Defrost the spinach overnight in the fridge. Then place in a cheesecloth or thin towel and squeeze out all excess liquid. (Do not skip this step!)

Step 2

Preheat oven to 375 degrees Fahrenheit.

Step 3

Sauté onion in butter (or oil) until beginning to soften. Add mushrooms and continue to sauté.

Step 4

Remove from pan and add spinach.

Step 5

In a separate bowl, whisk together eggs, dressing, salt, and cheese if using. Pour wet ingredients over the veggies and mix to combine.

Step 6

Place the mixture in an eight-inch square casserole dish and sprinkle the top with coating crumbs. Bake on 375 degrees for an hour.