Preheat the oven to 350°F. Lightly grease a 7×10 ceramic casserole dish with butter or spray oil and set aside.
Crack the eggs into a blender. Add the cottage cheese and salt. Blend on high for about 30 seconds, until smooth with no lumps.
Pour the blended egg mixture into the greased casserole dish.
Add the spinach, cherry tomatoes, basil, and mozzarella cheese to the casserole dish. Gently mix everything together with a spoon to evenly distribute the ingredients.
Place the casserole dish on the center rack of the oven.
Bake for 45 minutes to 1 hour, or until the top and edges are golden brown and crispy, and the center bounces back to the touch.
Remove from the oven and let cool for 5 minutes.
Slice into 6 squares and serve.