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For the quesadillas: 1.
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Heat a large skillet over medium high heat.
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Add sliced onion to the dry pan and cook, stirring frequently, until they have a deep brown color (about 5 minutes).
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Add 1 1/2 tablespoons olive oil and the sea salt and cook for another 5 minutes or until onions have softened completely.
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Remove to a plate.
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2.
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Add the remaining 1 1/2 tablespoons oil to the pan along with the sliced mushrooms.
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Cook until softened and brown.
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Add spinach leaves and stir until wilted, about 1-2 minutes.
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Remove mushrooms and spinach and set on a plate close to the stove.
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3.
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Meanwhile, in another skillet, grill one side of each of the 4 tortillas then remove to a plate.
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(Feel free to butter them first, but Ive found this isnt necessary if youre using a nonstick pan.)
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4.
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Place 1 tortilla (ungrilled side down) into the skillet.
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Top with half the cheese and toppings then a second tortilla (ungrilled side facing up).
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Grill until bottom tortilla is browned then flip and grill until the second tortilla is browned and cheese is fully melted.
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5.
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Repeat with the second quesedilla then serve immediately with cilantro lime dipping sauce.
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For the sauce: Combine all ingredients together.
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Season with salt.
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Thin with additional milk, hot sauce, or lime juice, if necessary.