Top with 4 cups of cauliflower florets & 1 cup thinly sliced red onion & 2 chopped hard boiled eggs.
Spread 3/4 cup of mayo over entire surface of salad. Sprinkle with 1/3 cup of grated Parmesan cheese & 1/3 cup of cooked chopped bacon.
Cover with plastic wrap & refrigerate overnight. Toss salad before serving.