Preheat your oven to 350°F (175°C) to ensure even cooking.
In a large mixing bowl, combine the thawed spinach, chopped scallions, chopped artichokes, diced red pepper, minced garlic, and chopped dill. Stir until well mixed.
In another bowl, whisk together the 8 large eggs, 4 large egg whites, and 1/4 cup of fat-free milk until smooth and frothy.
Pour the egg mixture over the vegetable mixture. Add 2 tablespoons of grated parmesan cheese, 1 1/4 teaspoons of kosher salt, and 1/4 teaspoon of ground pepper. Fold everything together gently until combined.
Fold in the crumbled feta cheese, being careful not to break it up too much to maintain some chunks.
Grease your 9x13-inch baking dish lightly with cooking spray or olive oil. Pour the mixture into the dish, spreading it out evenly.
Place the dish in the preheated oven and bake for 30 to 35 minutes, or until the edges are golden and the center is set.
Once baked, remove the dish from the oven and allow it to cool for 5-10 minutes. Slice into squares and serve warm.
