INGREDIENTS
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Ingredients
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1 frozen pie shell (9 inches)
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1 small red onion, sliced
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1/2 cup sliced fresh mushrooms
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1/4 cup diced yellow summer squash
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1 tablespoon butter
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1/2 cup fresh baby spinach
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3 garlic cloves, minced
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1 cup (4 ounces) shredded Swiss cheese
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4 eggs, lightly beaten
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1-2/3 cups heavy whipping cream
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1/2 teaspoon salt
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1/2 teaspoon minced fresh rosemary
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1/4 teaspoon pepper