veggie pizza recipe

1 pizza dough (store-bought or homemade) 1/2 cup pizza sauce 1 1/2 cups shredded mozzarella cheese 1/2 cup sliced bell peppers (any color) 1/2 cup sliced red onions 1/2 cup sliced mushrooms 1/2 cup cherry tomatoes, halved 1/4 cup sliced black olives 1/4 cup chopped spinach 1/4 cup crumbled feta cheese (optional)