• Preheat oven to 400°F (200°C)
• 10-cup (2.5 L) covered casserole dish
Cut orange and yellow peppers in half lengthwise and remove core and seeds.
Trim a thin slice off the bottom of each to allow them to lie flat. In the casserole dish, microwave peppers, covered, on High for 3 minutes, or until tender-crisp. Let cool to room temperature, covered. Drain and pat dry.
Prepare the stuffing: Meanwhile, in a large skillet, over medium heat, brown ground beef until no pink remains. Add onion, red pepper, mushrooms, rosemary, and thyme.
Cook, stirring, until onions are translucent, about 3 minutes. Drain off any fat.
Add chopped tomato and zucchini and cook, stirring, for 5 minutes. Stir in quinoa, salt, and pepper.
In the casserole dish, arrange tomato slices and add wine. Set each pepper half, cut side up, on a tomato slice.
Fill each pepper half with the beef mixture, mounding the stuffing.
Cover and bake in preheated oven for 15 minutes, or until bell peppers are fork-tender.
Uncover, top with Swiss cheese, and bake, uncovered, for 5 minutes more, or until cheese is melted.