Preheat oven to 375 degrees F and spray 9 x 13 baking dish with cooking spray. Set aside.
In a large mixing bowl, add eggs and whisk. Then add cottage cheese, milk, almost all of Parmesan cheese, salt, pepper and whisk well. Add spinach and stir to combine.
Pour egg mixture into previously prepared baking dish, sprinkle with remaining Parmesan cheese and bake uncovered for 35 minutes or until toothpick inserted in the center comes out clean.
Remove egg bake from the oven and let cool for 20 minutes. Cut into 8 slices and enjoy warm or cold.
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Notes
Store: Refrigerate leftovers in an airtight container for up to 5 days.
Freeze: Leftovers for up to 3 months. Thaw on a counter for 4-5 hours or in the fridge overnight. Reheat in a microwave, toaster oven or bake in regular oven at 350 degrees for 15 minutes.
Make ahead: Refrigerate egg bake assembled and covered with plastic wrap for up to 2 days. Bring to room temperature on a counter for 30 minutes and bake as per recipe directly from the fridge. It may require extra 10-15 minutes cook time.