Mediterranean Keto Grilled Vegetables

Grilled vegetables are one of those side dishes I make all summer long. They’re easy to prep, they cook while I’m standing at the grill anyway, and my kids actually eat them without complaining. Plus, keeping things keto-friendly doesn’t mean giving up flavor or saying goodbye to my favorite foods.

I love this recipe because it works with whatever you’ve got in the fridge. The marinade is simple – just oil, vinegar, and spices you probably already have in your pantry. No fancy ingredients or last-minute grocery runs required.

The best part? Everything goes on skewers, so there’s less to clean up and nothing falls through the grill grates. You can serve these alongside grilled chicken or steak, or honestly, I’ll just make a big batch and call it dinner. Sometimes simple is exactly what you need.

What Kind of Vegetables Should I Use?

For grilled vegetables, you’ll want to pick ones that hold up well to high heat and won’t fall apart on the grill. Zucchini, bell peppers, and mushrooms are perfect choices because they develop a nice char while staying tender inside. When selecting your veggies, look for firm zucchini without soft spots, bell peppers with smooth skin, and mushrooms that are dry to the touch. You can mix and match colors of bell peppers – red, yellow, and orange tend to be sweeter than green ones. If you want to switch things up, eggplant, asparagus, and red onions also grill beautifully and would work great in this recipe.

Options for Substitutions

This recipe is super flexible, so feel free to mix things up based on what you have:

• Zucchini: Yellow squash works just as well and grills up the same way. You can also try eggplant, but slice it a bit thicker (about ½ inch) and salt it for 15 minutes before grilling to remove excess moisture.
• Mushrooms: Any mushroom variety works here – portobello, cremini, or button mushrooms are all great choices. Just keep larger mushrooms whole or halved, and thread smaller ones on skewers.
• Bell peppers: Any color bell pepper works, or you can swap in poblano peppers for a mild kick. Just avoid thin-walled peppers that might char too quickly.
• Avocado oil: Olive oil is a perfectly fine substitute and adds a nice flavor. You could also use melted coconut oil or ghee if you prefer.
• Dried herbs: Fresh herbs work great too – just triple the amount since dried herbs are more concentrated. Italian seasoning is also an easy swap that covers most of these flavors in one go.

Watch Out for These Mistakes While Grilling

The biggest mistake when grilling vegetables is cutting them too thin, which causes them to fall through the grill grates or turn mushy – stick to those 1/4-inch planks for zucchini and keep pepper pieces large enough to flip easily.

Another common error is not preheating your grill long enough, so make sure it’s properly hot before adding your vegetables, or they’ll steam instead of getting those nice char marks you’re looking for.

To prevent sticking, brush the grill grates with a little extra oil right before adding your vegetables, and resist the urge to move them around too much – let them sit for 3-4 minutes per side to develop a good sear.

Finally, don’t crowd the grill since vegetables need space for proper heat circulation, so if you’re doubling the recipe, work in batches rather than piling everything on at once.

What to Serve With Grilled Vegetables?

These grilled vegetables are perfect alongside just about any protein you’re cooking on the grill – think chicken breasts, steak, or even grilled shrimp for a complete keto-friendly meal. I love serving them with a dollop of garlic aioli or tzatziki sauce on the side for dipping, which adds a nice creamy element that complements the smoky char. If you want to make it more filling, toss the grilled veggies over cauliflower rice or zucchini noodles, or pile them on top of a bed of mixed greens for a warm salad. They also work great as a side for grilled fish like salmon or halibut, where the herbs really tie everything together nicely.

Storage Instructions

Store: Keep your leftover grilled veggies in an airtight container in the fridge for up to 4 days. They’re great to have on hand for quick lunches or as a side dish throughout the week. I like to toss them into salads or eat them cold straight from the container for an easy snack.

Freeze: While you can freeze grilled vegetables for up to 2 months, just know they’ll lose some of their texture when thawed. If you do freeze them, they work best mixed into soups, casseroles, or frittatas rather than eating them on their own.

Reheat: Warm them up in a skillet over medium heat for a few minutes to bring back some of that grilled flavor. You can also microwave them for about a minute, though they won’t be quite as crispy. A quick toss in the air fryer at 375°F for 3-4 minutes works great too!

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 350-420
• Protein: 7-10 g
• Fat: 42-48 g
• Carbohydrates: 22-28 g

Ingredients

For the vegetables:

• 2 medium zucchini (cut into 1/2-inch thick rounds)
• 10 oz baby bella mushrooms (stems trimmed)
• 3 bell peppers (assorted colors, seeded and cut into 1-inch squares)

For the coating:

• 5 tbsp avocado oil or olive oil
• 1 tbsp balsamic vinegar
• 1/2 tsp dried oregano
• 1/2 tsp dried basil
• 1/2 tsp garlic powder
• 1/2 tsp dried rosemary, crushed
• 1/4 tsp red pepper flakes
• 1/2 tsp sea salt
• 1/4 tsp cracked black pepper

Step 1: Prepare and Trim the Vegetables

• 2 medium zucchini
• 10 oz baby bella mushrooms
• 3 bell peppers

Clean the baby bella mushrooms with a damp paper towel and trim the stems flush with the caps—this prevents them from becoming woody when grilled.

Cut the zucchini into 1/2-inch thick rounds (the thicker cut prevents them from falling apart on the grill and helps them develop a nice char while staying tender inside).

Seed the bell peppers and cut them into 1-inch squares, which are substantial enough to not slip through the grill grates.

Pat all vegetables dry with paper towels—this is crucial for achieving good caramelization and preventing steaming on the grill.

Step 2: Create the Herb Oil Marinade

• 5 tbsp avocado oil or olive oil
• 1 tbsp balsamic vinegar
• 1/2 tsp dried oregano
• 1/2 tsp dried basil
• 1/2 tsp garlic powder
• 1/2 tsp dried rosemary, crushed
• 1/4 tsp red pepper flakes
• 1/2 tsp sea salt
• 1/4 tsp cracked black pepper

In a small bowl, whisk together the avocado oil, balsamic vinegar, dried oregano, dried basil, garlic powder, crushed rosemary, red pepper flakes, sea salt, and cracked black pepper.

Let the mixture sit for 1-2 minutes so the dried herbs can begin to bloom and release their flavors into the oil.

I like to crush the rosemary between my fingers before adding it—this releases more essential oils and gives you a more vibrant herb flavor throughout the vegetables.

Step 3: Coat Vegetables and Let Rest

• prepared vegetables from Step 1
• herb oil marinade from Step 2

Place all prepared vegetables in a large bowl and pour the herb oil mixture over them.

Toss gently but thoroughly to coat every piece, making sure the mushrooms, zucchini rounds, and pepper squares are all evenly dressed.

Let the coated vegetables sit for 5-10 minutes at room temperature—this allows the oil and spices to adhere better and helps the herbs infuse into the vegetables.

I find that letting them rest briefly before grilling gives you more developed flavor than rushing straight to the heat.

Step 4: Preheat the Grill and Cook the Vegetables

• coated vegetables from Step 3

Heat your grill to medium-high heat (around 400°F if using a thermometer) and lightly oil the grill grates to prevent sticking.

Working in batches if needed to avoid overcrowding, grill the vegetables in a single layer.

Start with the mushrooms and zucchini (about 3-4 minutes per side) as these take slightly longer, then add the peppers in the final couple of minutes (they need about 2-3 minutes per side).

You want to see nice char marks and slight caramelization on the vegetables—this is where the flavor comes from—but they should still have a slight firmness when pierced with a fork, not mushy.

Step 5: Rest and Serve

• grilled vegetables from Step 4

Transfer the grilled vegetables to a serving platter and let them rest for 2-3 minutes.

This allows the residual heat to continue gently cooking them through while the exterior remains charred and flavorful.

Serve warm or at room temperature—these vegetables are delicious either way and make a perfect keto-friendly side dish.

Mediterranean Keto Grilled Vegetables

Delicious Mediterranean Keto Grilled Vegetables recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 10 minutes mins

Cook Time 20 minutes mins

Total Time 32 minutes mins

Servings: 4 servings

Calories: 385

Ingredients Method

Ingredients

  

For the vegetables

• 2 medium zucchini (cut into 1/2-inch thick rounds)
• 10 oz baby bella mushrooms (stems trimmed)
• 3 bell peppers (assorted colors, seeded and cut into 1-inch squares)

For the coating

• 5 tbsp avocado oil or olive oil
• 1 tbsp balsamic vinegar
• 1/2 tsp dried oregano
• 1/2 tsp dried basil
• 1/2 tsp garlic powder
• 1/2 tsp dried rosemary, crushed
• 1/4 tsp red pepper flakes
• 1/2 tsp sea salt
• 1/4 tsp cracked black pepper

Method

 

1. Clean the baby bella mushrooms with a damp paper towel and trim the stems flush with the caps—this prevents them from becoming woody when grilled. Cut the zucchini into 1/2-inch thick rounds (the thicker cut prevents them from falling apart on the grill and helps them develop a nice char while staying tender inside). Seed the bell peppers and cut them into 1-inch squares, which are substantial enough to not slip through the grill grates. Pat all vegetables dry with paper towels—this is crucial for achieving good caramelization and preventing steaming on the grill.
2. In a small bowl, whisk together the avocado oil, balsamic vinegar, dried oregano, dried basil, garlic powder, crushed rosemary, red pepper flakes, sea salt, and cracked black pepper. Let the mixture sit for 1-2 minutes so the dried herbs can begin to bloom and release their flavors into the oil. I like to crush the rosemary between my fingers before adding it—this releases more essential oils and gives you a more vibrant herb flavor throughout the vegetables.
3. Place all prepared vegetables in a large bowl and pour the herb oil mixture over them. Toss gently but thoroughly to coat every piece, making sure the mushrooms, zucchini rounds, and pepper squares are all evenly dressed. Let the coated vegetables sit for 5-10 minutes at room temperature—this allows the oil and spices to adhere better and helps the herbs infuse into the vegetables. I find that letting them rest briefly before grilling gives you more developed flavor than rushing straight to the heat.
4. Heat your grill to medium-high heat (around 400°F if using a thermometer) and lightly oil the grill grates to prevent sticking. Working in batches if needed to avoid overcrowding, grill the vegetables in a single layer. Start with the mushrooms and zucchini (about 3-4 minutes per side) as these take slightly longer, then add the peppers in the final couple of minutes (they need about 2-3 minutes per side). You want to see nice char marks and slight caramelization on the vegetables—this is where the flavor comes from—but they should still have a slight firmness when pierced with a fork, not mushy.
5. Transfer the grilled vegetables to a serving platter and let them rest for 2-3 minutes. This allows the residual heat to continue gently cooking them through while the exterior remains charred and flavorful. Serve warm or at room temperature—these vegetables are delicious either way and make a perfect keto-friendly side dish.