"These are really easy appetizers that you can make a few days in advance, and bake them the day they are needed. I am not a fan of onions, but these are delicious...."
INGREDIENTS
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3 large yellow onions
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1/4 cup butter
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1 (6 ounce) package cream cheese
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1 (6 ounce) package swiss cheese, grated
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1 package burrito-size flour tortilla