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Balsamic Portobello Burgers with Caramelized Onions & Garlic Aioli

These 10-ingredient portobello burgers are the best mushroom burgers we've ever had! It’s the balsamic-herb marinade and homemade garlic aioli that sets them apart. Sure to please plant-based and meat eaters alike!
These 10-ingredient portobello burgers are the best mushroom burgers we've ever had! It’s the balsamic-herb marinade and homemade garlic aioli that sets them apart. Sure to please plant-based and meat eaters alike!