In a skillet, crumble fry beef & mushrooms with spices until cooked. Drain & cool slightly. Carefully ‘spread’ cauliflower crust with tomato sauce. Top with mozzarella cheese, meat mixture, red peppers & sliced olives. Sprinkle with grated parmigano-reggiano & bake an additional 7-10 minutes, until cheese melted. Remove from oven & allow to cool for a few minutes before serving.