Grilled Cheese Sandwich Deluxe

Combine cheeses, mayonnaise, mustard, and chopped onion. Spread mixture on one side of 4 of the bread slices to within 1/4-inch of edges. Top with remaining bread slices. Spread softened butter on the outer sides of the sandwiches. Cook over medium heat in a hot skillet or griddle until golden brown, turning once.

Serves 4.

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