This is a grilled chicken burger topped with garlic-sautéed portobello mushrooms and melted Monterey Jack, built on a toasted whole-wheat bun. The whole thing comes together in 25 minutes with five main ingredients. It’s a solid weeknight option when you want something that feels a little more put-together without much extra effort.
What makes this version work
Two things carry this burger. First, browning the portobellos properly — not just warming them through, but letting them sit in the pan long enough to go golden and slightly crisp at the edges. That drives off excess moisture and concentrates their flavor, so they don’t turn the bun soggy. Second, the timing: cheese goes on the chicken while it’s still hot off the grill, not after assembly. That gives the Monterey Jack time to actually melt into the meat rather than just sitting on top as a cold slab.
What can go wrong
- Wet mushrooms flooding the bun: Portobellos release a lot of liquid. If your pan is too crowded or the heat too low, they’ll steam instead of brown. Use a wide pan, don’t overlap the slices, and keep the heat at medium-high.
- Dry chicken breast: Chicken breast goes from done to dry fast. Pull it off the grill the moment it hits 165°F (74°C) internal — don’t guess. A cheap instant-read thermometer pays for itself here.
- Garlic burning: Garlic goes in with the oil before the mushrooms, which means it can scorch if the pan is already ripping hot. Add the garlic to a cold or just-warm pan, then bring the heat up together.
- Bun going soggy before serving: Toast the buns cut-side down on the grill grate or in a dry skillet until they’re lightly golden. A toasted surface resists moisture from the mushrooms much better than an untoasted one.
Smart swaps
- Monterey Jack: This is the mildest swap-friendly cheese in the burger world. Provolone, mozzarella, or a white cheddar all melt well and won’t fight the mushroom flavor. Pepper Jack works if you want a little heat.
- Portobello mushrooms: Large cremini mushrooms (baby bellas) sliced thick are the obvious substitute — same flavor, easier to find, often cheaper. Regular white button mushrooms work too but have less depth.
- Whole-wheat buns: Any standard burger bun works. Brioche will be richer; a plain sesame bun keeps it neutral. Just make sure it’s sturdy enough to hold the mushrooms without collapsing.
- Olive oil: Any neutral cooking oil — avocado, canola, vegetable — works fine for sautéing the mushrooms. Save the good olive oil for finishing if you have it.
Storage and reheating
Store the grilled chicken and sautéed mushrooms separately in airtight containers in the fridge for up to 3 days. Don’t assemble the burger ahead — the bun gets soft fast once the mushrooms are involved. To reheat, warm the chicken in a covered skillet over medium-low heat with a splash of water for about 3–4 minutes, and reheat the mushrooms in a dry pan over medium heat until warmed through. The microwave works in a pinch but tends to toughen the chicken. For freezing, the cooked chicken breast freezes well for up to 2 months; the sautéed mushrooms are better made fresh since they go mushy after freezing.
Grilled Chicken Portobello Jack Burger
Equipment
- Grill (gas or charcoal)
- 10-inch non-stick or cast-iron skillet
- Instant-read thermometer
- Spatula
- Cutting board
Ingredients
- 2 pieces boneless, skinless chicken breasts about 6oz / 170g each, seasoned with salt and pepper
- 1 clove garlic minced, about 1 teaspoon
- 2 medium portobello mushroom caps about 4oz / 115g each, sliced ¼-inch thick
- 2 slices Monterey Jack cheese about 1oz / 28g each
- 2 medium whole-wheat burger buns split
- 1 tablespoon olive oil
- 1 pinch salt to taste
- 1 pinch ground black pepper to taste
Instructions
- Heat 1 tablespoon olive oil in a 10-inch skillet over medium-high heat. Add the minced garlic and cook for 30 seconds until fragrant. Add the sliced portobello mushrooms in a single layer, season with salt and pepper, and cook undisturbed for 2–3 minutes until golden on the bottom. Flip and cook for another 2–3 minutes until tender and caramelised. Set aside.1 tablespoon olive oil, 1 clove garlic, 2 medium portobello mushroom caps, 1 pinch salt
- Preheat grill to medium-high heat (about 400°F / 200°C). Grill the seasoned chicken breasts for 5–7 minutes per side, or until the internal temperature reaches 165°F / 74°C on an instant-read thermometer. Immediately place a slice of Monterey Jack on each chicken breast while still on the grill, close the lid, and let the cheese melt for about 1 minute. Remove and let rest for 2–3 minutes. Toast the split buns cut-side down on the grill for 1–2 minutes until lightly charred.2 pieces boneless, skinless chicken breasts, 2 slices Monterey Jack cheese, 2 medium whole-wheat burger buns
- Place each chicken breast on a toasted bun bottom, top with the sautéed portobello mushrooms, and close with the bun top. Serve immediately.2 pieces boneless, skinless chicken breasts, 2 medium portobello mushroom caps, 2 slices Monterey Jack cheese, 2 medium whole-wheat burger buns
Notes
Nutrition
Frequently asked questions
Can I cook this entirely on the grill without using the stovetop?
Yes — if your grill has a side burner, use it to sauté the mushrooms in a cast iron or grill-safe skillet while the chicken cooks on the main grate. You can also grill the portobello slices directly on the grate over medium heat for about 3–4 minutes per side, though they’ll have a smokier flavor and slightly different texture than pan-sautéed.
How do I know when the chicken breast is done without drying it out?
Pull it at exactly 165°F (74°C) internal temperature — that’s the safe minimum for poultry and the point before it starts to dry out noticeably. Let it rest for 2–3 minutes before assembling; the temperature will hold and the juices will redistribute slightly.
Do I need to remove the gills from the portobello mushrooms?
Not for this recipe since the mushrooms are sliced rather than used as a whole cap. If you were using them whole, scraping the gills prevents a dark, slightly bitter liquid from bleeding into everything else — but sliced and sautéed, it’s not a problem worth the extra step.
What to cook next
- Wendy’s Grilled Chicken Remake
- Mushroom Swiss King Copycat
- Pretzel Bacon Pub Chicken
- Smoky Mountain BBQ Chicken Sandwich