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Heat oven to 200C.
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Line the baking sheet with aluminum foil.
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In a bowl, toss together mushrooms, tomatoes, and cheese.
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Season to taste.
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Spoon ΒΌ of the mixture into the center of tortilla.
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Fold in the tortilla sides and roll tortilla from bottom to the top.
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Place the chimichanga seam side down on the baking sheet.
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Brush the tortillas with butter.
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Bake the chimichanga for 25 minutes.
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Serve warm.