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1
Heat 2 teaspoons (10ml) oil in a 10-inch cast iron or nonstick skillet over high heat until oil just starts to smoke. Add zucchini, season with salt, and cook, tossing and stirring frequently, until zucchini is lightly browned, about 2 minutes. Add corn kernels and continue cooking, tossing frequently, until corn is lightly browned, about 2 minutes longer. Add jalapeno and cook, tossing constantly, until softened, about 30 seconds. Stir in cilantro and transfer mixture to a medium bowl.
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2
Add cheese to zucchini mixture and mix to combine. Spread half of mixture evenly over half of one tortilla, leaving a 1/2-inch border. Fold tortilla over and seal edges by pressing down firmly. Repeat with remaining filling and second tortilla.
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3
Heat remaining 2 tablespoons (30ml) oil in same skillet over medium heat until shimmering. Carefully add both folded tortillas and cook, swirling and moving tortillas around, until golden brown and puffy on first side, about 2 minutes. Using a flexible metal spatula, flip quesadillas, season with salt, and continue cooking until golden brown and puffy on second side, about 2 minutes longer.
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4
Transfer quesadillas to a paper towel to drain. Cut into triangles and serve immediately.
