Creating this delightful side dish is simple and straightforward. Follow these easy steps:

1. Preheat Your Oven: Set your oven to 425°F (220°C). This high temperature will help your vegetables caramelize, bringing out their natural sweetness.
2. Prepare the Vegetables: Begin by washing and drying all your vegetables thoroughly. Chop the bell peppers, slice the carrots, squash, and onion, and cut the broccoli into florets. Halve the cherry tomatoes.
3. Combine Ingredients: In a large mixing bowl, add all the chopped vegetables. Drizzle with olive oil, then add the minced garlic, salt, black pepper, dried oregano, and fresh rosemary.
4. Toss Vegetables: Using your hands or a large spoon, gently toss the vegetables until they are evenly coated with oil and seasonings.
5. Arrange on Baking Sheet: Spread the vegetables in a single layer on a large baking sheet. Ensure they do not overlap too much, as this will help them roast evenly.
6. Roast the Vegetables: Place the baking sheet in the preheated oven. Roast for 20-25 minutes, stirring halfway through, until the vegetables are tender and slightly charred around the edges.
7. Add Lemon Juice: Once roasted, remove the vegetables from the oven and drizzle with fresh lemon juice for a touch of brightness.
8. Serve: Transfer the roasted vegetable medley to a serving dish and enjoy immediately while hot.