Becky Luigart-Stayner; Lydia DeGaris-Pursell
6 servings

How to Make It

Step 1

Combine first 6 ingredients in a large zip-top plastic bag. Add mushroom caps; seal and marinate in refrigerator 24 hours.

Step 2

Prepare grill or broiler.

Step 3

Remove mushroom caps from bag, discarding marinade. Place mushroom caps on grill rack or broiler pan coated with cooking spray; cook 5 minutes or until tender.

Step 4

Heat the oil in a medium nonstick skillet over medium-high heat. Add onion; cover and cook 10 minutes or until golden brown, stirring frequently.

Step 5

Combine mayonnaise and roasted garlic in a small bowl. Spread 1/2 tablespoon mayonnaise mixture evenly over the top halves of buns; top each bottom half of bun with 1 lettuce leaf, 1 tomato slice, 1 mushroom cap, 1 tablespoon caramelized onion, and top half of bun.

Ratings & Reviews

carolfitz's Review

August 18, 2012
Really good. Removed gills from mushrooms. Subbed fresh basil for dried. Used raw minced garlic, so the mayo spread wasn't sweet/mellow. Made half as cheeseburgers with one slice provolone per mushroom. Great flavors.

shellihh's Review

October 03, 2011
Wonderful. Super easy, super fast (just have to remember to marinade the mushrooms the night before...), super yummy. We actually didn't use roasted garlic- just minced 2 cloves right into the mayo along with some more dried basil - and it gave it a nice bite. Will definitely make again.

ABQlynda's Review

March 26, 2011
Incredibly yummy! Didn't marinate over night- just a couple hours. Made extra onions (2X the recipe) cuz we LOVE onions and they compliment the mushrooms! Added a little balsamic to the onions while cooking. Worthy of ANY occasion. My husband would prefer to great stuffed turkey burgers! Served with sweet potato fries (from the oven!)