Use a charcoal grill and grill the sausages, bell pepper, sliced onions and sliced button mushrooms. Sprinkle olive oil over vegetables and salt and pepper.
Slice sausage into small pieces.
Remove chard off bell pepper and slice.
Top pizza with sausage, pepper, onion and mushrooms. Finish with mozzarella cheese.
Preheat oven to 450 degrees.
Place on rack and cook until the cheese is golden brown, about 15 to 20 minutes. Remove and rest for 5 minutes. Sprinkle with a little olive oil. Serve.