Alexa's Gourmet Grilled Cheese
Ingredients:
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4 slices marbled rye bread, divided
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4 teaspoons softened salted butter, or as needed, divided
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2 teaspoons Dijon mustard, or to taste
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4 slices shredded sharp Cheddar cheese
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4 slices Swiss cheese (such as LorraineĀ®)
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1 tomato, thinly sliced
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1 avocado - peeled, pitted, and thinly sliced