This Portobello Mushroom Burger is vegetarian, healthy, can be gluten free, and is topped with caramelized onions, a homemade basil pesto, and goat cheese! So let me be honest for a second. I thought this portobello mushroom burger was going to be good, but I didn't think it was going to be this good. Good, like, I've never gotten cravings for a portobello mushroom burger before, but now I do. Good, like, I devoured the whole thing in 2.5 seconds. Good, like... ok I'll stop...you get it. It's good. ;) I should mention though that this portobello mushroom burger is

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