Preheat oven to 425 degrees Line a large rimmed baking sheet with nonstick foil or parchment paper.
Place chopped vegetables into a large bowl.
In a small bowl, whisk together olive oil, lemon juice and zest, rosemary, and garlic and pour over vegetables. Toss to coat well.
Arrange vegetables on prepared sheet pan. Try to keep a little bit of space between the vegetables if possible so they can cook evenly. Use two sheet pans if necessary. Sprinkle evenly with salt and pepper.
Roast for 20 minutes, then stir and roast an additional 15-20 minutes or until veggies are tender. The actual cooking time could vary quite a bit depending on how small you cut your vegetables.
Serve immediately.
Notes
Cut all vegetables to similar sizes (1-1.5 inch pieces) for even cooking.
Don't overcrowd the pan. Use two sheet pans if needed to keep vegetables in a single layer with space between pieces.
Roast uncovered at 425°F for crispy, caramelized edges.
When mixing vegetables with different cook times, add quicker-cooking ones halfway through or roast separately.
Longer-cooking vegetables (40-45 min at 425°F): potatoes, sweet potatoes, carrots, butternut squash, beets, Brussels sprouts, onions.
Medium-cooking vegetables (25-30 min at 425°F): broccoli, cauliflower, asparagus, green beans.
Quick-cooking vegetables (15-20 min at 425°F): bell peppers, zucchini, mushrooms, cherry tomatoes.
Stir or flip vegetables once at the 20-minute mark for even browning.
Vegetables are done when fork-tender with golden brown, caramelized edges.
Store leftovers in an airtight container in the fridge for 3-4 days. Reheat in the oven or microwave, or enjoy cold.
Perfect for meal prep. Add to containers with rice and protein for easy lunches.
Freezing is not recommended as vegetables will get mushy when reheated.