Preheat oven to 375 degrees. Spray a small baking dish (8×8 or smaller) with non-stick cooking spray. Set aside.
Combine spinach, seasonings, onions and 1/4 cup water in sauté pan and cover. Steam until spinach wilted and onion is softened, stirring occasionally. Remove cover and continue to stir and cook until water is completely evaporated (or cooked off). Add water chestnuts, stir to combine, and turn off heat.
Meanwhile, blend cottage cheese in the blender or food processor until smooth. Add to the sauté pan, along with the rest of the cheeses. Pour into baking dish and top with cheese.
Bake for 15-20 minutes, or until cheese is melted and lightly golden brown on top. Enjoy warm with pita chips, veggies, or whatever you choose!