Place the cauliflower rice in a microwave safe bowl and cook the cauliflower in the microwave for about 6 minutes, 2 minutes at a time, mixing to ensure all grains are cooked evenly. Set aside and let it cool.
Once the cauliflower is cool add the salt, Parmesan cheese, dried parsley, and egg. Mix all until combined.
Cover a baking sheet with parchment paper and split the mixture into 4 over the parchment paper. Spread each portion making squares of about 1/4 inch tall (you want to mimic the same thickness of a sandwich bread slice). Place in the oven and bake each side for about 15 min.
Once that is complete transfer the cauliflower sandwich slices to a plate and set aside.
Using a non-stick frying pan over stove top, spray with coconut oil and add one slice, add your fillings (we used 2 slices of provolone cheese), and cover with a second slice. Cover with a pan lid and cook until the bread starts to golden and the cheese is fully melts (about 5 min each side). Enjoy hot!