INGREDIENTS
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24 (3 inch) frozen tart shells, thawed
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6 slices bacon, or more to taste
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1 cup shredded Swiss cheese
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2 green onions, diced
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4 eggs
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1 1/4 cups milk
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1 teaspoon Dijon mustard
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1/4 teaspoon salt
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1/4 teaspoon ground black pepper
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1/4 cup shredded Swiss cheese, or as needed (optional)