1. Preheat the Oven
Preheat your oven to 400°F (200°C).
Lightly grease a medium baking dish with a little olive oil or cooking spray.
A 9×13-inch baking dish works well, although a slightly smaller casserole dish can also be used for a deeper casserole.
2. Prepare the Broccoli
Wash the broccoli thoroughly and cut it into bite-sized florets.
Try to keep the florets relatively similar in size so they cook evenly.
If the stems are tender, don’t throw them away. Peel the tough outer layer and slice the tender centre into small pieces.
3. Prepare the Other Vegetables
Dice the onion.
Mince the garlic.
Halve the cherry or grape tomatoes.
If using zucchini, mushrooms, or bell peppers, cut them into similar-sized pieces.
Place all of the vegetables in a large mixing bowl.
4. Season the Vegetables
Add the broccoli, onion, tomatoes, and any optional vegetables to the bowl.
Drizzle with 2 tablespoons olive oil.
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