If you've ever wondered whether it's worth firing up the grill just to eat leftovers all week, I can confirm: yes, absolutely, do it. This grilled vegetable meal prep is one of those rare recipes that actually gets better as the days go on - the veggies keep soaking up flavor from the marinade, and by day three or four they're somehow even more delicious than the night you grilled them. It's a 30-minute, hands-off way to guarantee you have a flavorful, ready-to-go component for dinners all week long.
This is one of my go-to summer and early fall meal prep components, since grilling season means I usually already have the grill hot for something else. But honestly, this recipe earns a spot in the weekly rotation any time of year - it's the difference between scrambling to figure out dinner and having a flavorful base ready to build on in under 30 minutes, no matter how busy the week gets.
This is one of my favorite high-protein meal prep bowl components!
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Ingredients
The magic here is really in the marinade...a simple mix of olive oil, garlic, and Italian seasoning that coats every piece of vegetable and keeps building flavor the longer it sits. I like a mix of zucchini, yellow squash, bell peppers, and red onion for color and texture, but almost any sturdy vegetable works. Here's everything you'll need.
- Zucchini, sliced into rounds or planks
- Yellow squash, sliced into rounds or planks
- Bell peppers, cut into large pieces
- Red onion, cut into wedges
- Olive oil
- Fresh garlic, minced
- Italian seasoning
- Salt and pepper
- Balsamic glaze, for serving
See recipe card for quantities.
Instructions
This recipe is as low-effort as meal prep gets: marinate, grill, and cool. Here's how it comes together, step by step.
- Step 1: Add the sliced vegetables to a large zip-top bag with the olive oil, minced garlic, Italian seasoning, salt, and pepper. Seal and toss to coat everything evenly, then let marinate at room temperature for 30 minutes.
- Step 2: Preheat the grill to medium-high heat. Arrange the marinated vegetables directly on the grates or in a grill basket, working in batches if needed so nothing is overcrowded.
- Step 3: Grill for 8-10 minutes total, turning occasionally, until the vegetables are charred in spots and fork-tender. Bell peppers and onion may take a minute or two longer than the squash.
- Step 4: Transfer the vegetables to a sheet pan or platter to cool completely before portioning into meal prep containers. This keeps them from steaming and going soft in the fridge.
Hint: let the vegetables cool fully, uncovered, before sealing them in containers - trapping steam is what makes meal-prepped vegetables turn mushy and watery by day two.
Why These Taste Better As the Week Goes On
Unlike most cooked vegetables, this marinade keeps working on the veggies even after they come off the grill. The olive oil, garlic, and Italian seasoning continue to soak in as they sit in the fridge, so instead of tasting like day-old leftovers, they taste more seasoned and flavorful with every passing day - which is exactly why this has become one of my most-repeated meal prep components.
Substitutions
This recipe is easy to adjust based on what's in season or what you have in the fridge. Here are a few swaps I've tried and can vouch for.
- Vegetables - mushrooms, asparagus, cherry tomatoes, or eggplant all grill beautifully in place of (or alongside) the zucchini and squash
- Italian seasoning - swap in a Greek seasoning blend or fresh chopped herbs like basil and oregano for a different flavor direction
- Olive oil - avocado oil works well if you need a higher smoke point or just prefer the flavor
- No grill - a grill pan on the stovetop or roasting at 425°F for 20-25 minutes both work, though you'll lose some of the smoky char flavor
This recipe is naturally gluten free, dairy free, vegan, and vegetarian as written, which makes it an easy component to add to almost any meal prep plan without extra adjustments.
Variations
This is the real reason grilled vegetables earn a permanent spot in my meal prep rotation - they work in almost anything. Here are my favorite ways to use them throughout the week.
- Room temp or cold - drizzle with balsamic glaze and eat straight out of the container as a quick side
- In a sandwich or wrap - pile them onto crusty bread with a smear of hummus or goat cheese
- Mediterranean bowl - combine with grilled steak, crispy chickpeas, crumbled feta, and diced cucumber for a dinner that comes together in under 30 minutes
- Stirred into pasta or grain bowls - toss with warm pasta, farro, or rice and a splash of the leftover marinade
What's your go-to meal prep component? I'd love to hear how you're using these throughout the week.
Equipment
You don't need anything fancy for this recipe, but a few basics make it come together faster and with less cleanup.
A large zip-top bag is the easiest way to marinate without dirtying a bowl, and a grill basket keeps smaller pieces from falling through the grates if you're not using large planks or wedges. I like using this stainless steel grill basket (affiliate link) for easy flipping and less sticking.
Storage
Store the cooled vegetables in an airtight container in the fridge for up to 5 days - and true to the name, they genuinely taste more flavorful by day 3 or 4 as the marinade continues to soak in. Keep any balsamic glaze or dressing separate until you're ready to eat.
These vegetables do freeze, though the texture will soften once thawed, so they're best reserved for stirring into soups, pasta, or grain bowls rather than eating on their own. Freeze in an airtight container for up to 2 months and thaw overnight in the fridge.
Top Tip
Don't skip letting the vegetables cool completely and uncovered before sealing them in containers. Sealing them while warm traps steam, and that trapped moisture is what turns great grilled vegetables into soggy ones by the second day.
FAQ
Yes - as long as they're marinated in oil, garlic, and seasoning, the flavors continue to soak into the vegetables while they sit in the fridge, so they often taste more flavorful by day 3 or 4 than they did the night you grilled them.
Absolutely. They're delicious cold or at room temperature, especially drizzled with balsamic glaze or tossed into a salad or grain bowl - no reheating required.
Stored in an airtight container, they'll keep well for up to 5 days, which makes them an ideal Sunday meal prep component for the week ahead.
Related
Looking for other meal prep recipes like this? Try these:
Grilled Vegetable Meal Prep
Ingredients
- 2 medium zucchini sliced into ½-inch rounds or planks
- 2 medium yellow squash sliced into ½-inch rounds or planks
- 2 bell peppers cut into large pieces
- 1 red onion cut into wedges
- 3 tablespoons olive oil
- 3 cloves garlic minced
- 1 tablespoon Italian seasoning
- ½ teaspoon salt plus more to taste
- ¼ teaspoon black pepper
- Balsamic glaze for serving (optional)
Instructions
- Add the zucchini, squash, bell peppers, and red onion to a large zip-top bag with the olive oil, garlic, Italian seasoning, salt, and pepper. Seal and toss to coat evenly. Let marinate at room temperature for 30 minutes.
- Preheat the grill to medium-high heat (about 400-450°F).
- Arrange the marinated vegetables directly on the grates or in a grill basket, working in batches if needed.
- Grill for 8-10 minutes total, turning occasionally, until charred in spots and fork-tender. Peppers and onion may need a minute or two longer than the squash.
- Transfer to a sheet pan or platter and let cool completely, uncovered, before portioning into meal prep containers.
- Serve warm, at room temperature, or cold, drizzled with balsamic glaze if desired.
