Caramelized Onion and Parmesan Burgers Recipe

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Full Recipe

https://www.thespruceeats.com/caramelized-onion-parmesan-burgers-recipe-2097315

Author

Katie Workman | 2016-02-01

Description

The first time I made these for my family, I didn't mention the fact that they were half mushroom, half beef, and the burgers were completely devoured.