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Preheat oven to 400 degrees F. Coat a large baking sheet with cooking spray.
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In a large bowl, combine the beans, chilies, and lime juice. Mash with a fork or potato masher until paste forms. Add the chili powder, cumin, salt, and garlic.
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Fold in the sweet corn and spinach.
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Warm the tortillas up in the microwave for 10 seconds each, or warm in a large skillet.
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Place a few strips of the pepper jack cheese on the left side of a tortilla, then add 2-3 tablespoons of the filling. Roll the tortilla up tight and place on baking sheet. Continue with the rest of the tortillas.
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Lightly spray the flautas with cooking spray and bake for 10 minutes. Flip over, and bake for another 7 minutes, until brown and crispy.
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Serve with a dollop of sour cream, guacamole and sprinkle with chopped cilantro!