Easy Grilled Peppers and Onions (Foil Pack!)

These easy grilled peppers and onions are my go-to summer side dish, and I make them in a foil pack at least a few times a week all grilling season long. You get perfectly tender, caramelized veggies with absolutely zero cleanup — no grill basket, no pepper strips falling through the grates, and no scrubbing the grill afterward. Just 5 simple ingredients and about 25 minutes on the grill!

These easy grilled peppers and onions are made in a simple foil pack with just 5 ingredients — bell peppers, onion, olive oil, garlic, and salt and pepper. The foil traps steam and heat so the veggies turn perfectly tender and caramelized without any fuss. The simplest, most hands-off summer side dish for any cookout.

⏱️ Total: 25 minutes · 🍽️ Yield: 4 servings · 📊 Level: Easy · 🥗 Diet: Vegan, Gluten-Free, Whole30

Why You’ll Love This Recipe

• Only 5 ingredients: Bell peppers, onion, olive oil, garlic, and salt and pepper — that’s it. No fancy marinades or special equipment needed.
• Foil pack = zero cleanup: No grill basket, no veggies slipping through the grates, and when you’re done, just toss the foil. I started making these in foil packs after losing one too many pepper strips through the grill grates — and I’ve never looked back.
• Endlessly versatile: Serve them as a side, pile them onto burgers, stuff them into fajitas, or toss them with pasta. They go with absolutely everything.
• Healthy and hands-off: Naturally vegan, gluten-free, and Whole30-friendly. Just seal the pack and let the grill do the work.

Featured Ingredients

• Bell peppers: Any color works, but I love using a mix of red, yellow, and orange for the best visual appeal and sweetness. Red, yellow, and orange peppers are sweeter and caramelize beautifully on the grill, while green bell peppers are slightly more bitter but add a nice contrast if you like that flavor.
• Onion: Yellow onion is my go-to because it gets the sweetest when caramelized. Red onion holds its shape really well and adds gorgeous color. White onion works but has a sharper bite.
• Olive oil: Coats the veggies so they caramelize without sticking to the foil. You can sub avocado oil (higher smoke point, neutral flavor) or even melted butter for a richer taste.
• Minced garlic: Fresh minced garlic is best, but jarred minced works in a pinch. For a mellower flavor, try whole smashed cloves — they’ll roast beautifully inside the foil pack. Garlic powder (about ½ teaspoon) is the easiest sub.
• Salt and pepper: Go generous — the veggies can handle it. Or swap in your favorite spice blend (keep reading for my favorite variation ideas!).

How to Make Grilled Peppers and Onions in Foil

Start by slicing your peppers into strips about ½-inch wide and cutting your onions into thick half-moons. Toss everything in a big bowl with olive oil, minced garlic, salt, and pepper until evenly coated. You want every strip glistening — that’s what gives you those caramelized edges.

Lay out a large sheet of heavy-duty aluminum foil, pile the seasoned veggies in the center, and top with a second sheet of foil. Fold and crimp all 4 edges tightly to seal — you want the pack airtight so steam builds inside and does the heavy lifting. I always double-wrap my foil packs after learning the hard way that a single layer can tear, sending garlic oil dripping straight onto the flames (not ideal!).

Place the pack directly on the grill grates over medium-high heat (about 400°F) and let it cook for about 20 minutes. When you peel back that foil, the veggies should be perfectly tender with lightly charred, caramelized edges. Full step-by-step instructions and measurements are in the recipe card below!

Foil Pack vs. Grill Basket vs. Direct Grilling

Not sure which method is right for you? Here’s a quick breakdown of the three most popular ways to grill peppers and onions:

• Foil pack (this recipe!): The easiest, most hands-off method. The foil steams and caramelizes the veggies at the same time, and cleanup is as simple as tossing the foil. Best for weeknight grilling when you want zero fuss.
• Grill basket: Great for getting more direct char while still keeping small pieces contained. You’ll need a grill basket (about $15–25 at most stores). Best when you want that open-flame flavor with a little more control.
• Direct on the grates: Maximum char and smoky flavor. Cut peppers into large planks and onions into thick rounds so they don’t fall through. Best for experienced grillers who want restaurant-level results — just requires more attention and larger cuts.

Any method works beautifully, but the foil pack is my go-to for sheer ease and consistency. Toss, seal, grill, done!

Pro Tips for the Best Grilled Peppers and Onions

• Heavy-duty foil is a must: Regular foil tears too easily. If you only have thin foil, double up the layers for extra insurance.
• Don’t overcrowd the pack: Spread veggies in a single-ish layer so heat circulates evenly. If you’re grilling for a crowd, make 2 separate packs rather than one giant one.
• Slice evenly: Uniform ½-inch strips ensure everything cooks at the same rate — no burnt bits mixed with raw pieces.
• Let them rest 2 minutes: After pulling the pack off the grill, let it sit sealed for a couple of minutes. The residual steam finishes cooking and the flavors meld together.
• Char trick: Want more color and crispiness? Open the foil pack for the last 3–4 minutes of grilling to let direct heat kiss the veggies. I do this every single time now — it’s a game changer!
• Gas vs. charcoal: Both work great. Charcoal gives more smoke flavor while gas gives more consistent heat. Either way, aim for about 400°F.

One of my favorite things about grilled peppers and onions is how easy they are to customize. Here are 5 flavor spins I come back to all summer:

• Fajita-style: Toss with cumin, chili powder, and a squeeze of lime after grilling. Perfect for loading into tortillas — pair them with my steak fajitas for a full Tex-Mex spread.
• Italian: Add balsamic vinegar and dried Italian seasoning before grilling. Finish with fresh basil and a drizzle of your best olive oil.
• Asian-inspired: Swap olive oil for sesame oil, add a splash of soy sauce and a pinch of red pepper flakes. Finish with toasted sesame seeds.
• Smoky Southwest: Add smoked paprika, garlic powder, and a pinch of cayenne. Amazing alongside grilled chicken or burgers.
• Lemon herb: Toss with lemon zest, dried oregano, and a squeeze of fresh lemon juice after grilling. Light and fresh — perfect with grilled fish.

What to Serve with Grilled Peppers and Onions

With proteins:

As part of a meal:

• Pile onto hoagies for a Philly-style pepper and onion sub
• Stuff into tortillas for easy veggie fajitas
• Toss with cooked pasta and a drizzle of balsamic
• Serve over rice bowls with avocado and black beans

With other grilled sides:

Storage and Reheating

• Fridge: Store leftover grilled peppers and onions in an airtight container for up to 4 days.
• Freezer: Freeze in a single layer on a baking sheet, then transfer to a freezer bag. They’ll keep for up to 3 months.
• Reheating: Best reheated in a hot skillet for 2–3 minutes to restore some of that char. The microwave works in a pinch but the texture will be softer. Don’t re-grill in a new foil pack — they’ll turn mushy.

FAQs

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