Preheat the oven to 425°F (220°C).
Chop the bell pepper, zucchini, red onion, and cherry tomatoes into bite-sized pieces.
Toss the chopped vegetables with olive oil, mixed dried herbs, salt, and pepper. Spread them on a baking sheet.
Roast the vegetables in the preheated oven for about 20-25 minutes, stirring halfway through until tender and slightly caramelized.
While the vegetables are roasting, heat a non-stick skillet over medium heat.
Add the lean ground beef to the skillet. Season with salt, pepper, and a pinch of additional herbs if desired.
Cook the beef until browned and fully cooked through, breaking it up into crumbles, approximately 6-8 minutes.
Stir in the pre-cooked quinoa with the beef, heating through for 2 minutes.
Combine the roasted vegetables with the beef and quinoa mixture in the skillet. Adjust seasoning as needed.
Serve warm and enjoy your balanced, nutrient-rich meal.