Spray the squash with cooking spray or brush with olive oil. Then, sprinkle with Everything but the Bagel seasoning.
Place the block of feta cheese, fresh herbs, sliced cherry tomatoes, and diced onion into a greased baking dish.
Heat a skillet to medium-heat. Then, add the ground turkey, minced garlic, and Italian seasoning. Cook until the meat is done.
Shred the spaghetti squash and place into the casserole dish with the baked feta and vegetables. Fold in chopped spinach, pesto and turkey.
Top the casserole with mozzarella cheese. Broil at 500°F for 3-5 minutes or until cheese starts to bubble/brown.
Serve hot or put into meal prep containers for the week!