Scoop the quinoa into the sauté pan and mix thoroughly with a spoon until it is blended with the vegetables to make an aromatic stuffing. Remove from heat.
Create a lid for each tomato by cutting a star shape around the stem about ¼-inch deep. Remove the top and set it aside.
Scoop out the seeds of each tomato and some of the loose pulp, being careful to leave a strong wall of tomato all around.
Spoon equal amounts of the stuffing into the cavities of each tomato, filling them up generously.
Put the tomatoes in a small ceramic or glass baking dish and garnish with a sprinkle of bread crumbs and one teaspoon Parmesan cheese per tomato.
Cover the baking dish with a glass lid or foil and bake for 25 minutes. Tomatoes should be firm and easy to transfer from the baking dish to the serving plates.
Garnish by putting the star-shaped tomato lids back on top of each tomato.