Preheat your oven to 425°F (220°C).
Dice the zucchini, red bell pepper, and yellow onion into bite-sized pieces. Mince the garlic.
Spread the vegetables on a baking sheet, drizzle with olive oil, and season lightly with salt, pepper, thyme, and rosemary.
Roast the vegetables in the oven for about 15-20 minutes or until tender and slightly caramelized, stirring halfway through.
While the vegetables roast, heat a skillet over medium-high heat. Add the lean ground beef and cook, breaking it up with a spatula, until fully browned and cooked through.
Stir in the minced garlic to the beef during the last minute of cooking to release its aroma.
Once the vegetables are done, combine them with the cooked beef in the skillet and gently toss to mix the flavors.
Taste and adjust seasoning with additional salt and pepper if needed. Serve hot and enjoy your balanced, herb-seasoned meal.