Preheat oven to 325°F. Spray a 9-inch springform pan with nonstick cooking spray.
Place pressed cottage cheese, spinach, cream cheese, Romano cheese, egg, egg whites, garlic, basil, salt and pepper in a food processor. Process until smooth. Spoon the spinach mixture into the prepared pan and smooth the top with a spatula. Bake until firm, about 1 hour. Cool on a wire rack.
Place the pan on a serving plate, run a knife around the outer edge and remove pan sides. Garnish with tomatoes or basil leaves, if using.