Preheat the oven to 180°C (350°F).

In a skillet, heat the olive oil over medium heat. Add the chopped onion and minced garlic, and sauté until translucent.

Add the ground beef to the skillet and cook until browned.

Stir in the cooked rice, herbes de Provence, salt, and black pepper. Mix well.

Stuff the hollowed tomatoes with the beef and rice mixture.

Place the stuffed tomatoes in a baking dish and top with grated cheese.

Bake in the preheated oven for 45 minutes, or until the tomatoes are tender.