Instructions: Over medium-high heat melt 1 teaspoon butter in large non-stick skillet coated with cooking spray. Add onion and cook 4 minutes or until golden brown, stirring frequently. Reduce heat. Cook 10 minutes or until tender, stirring occasionally. Set aside.

Preheat broiler. Combine beef, pepper and salt in a medium bowl. Divide beef mixture into 4 equal portions, shaping each into a 1/4 inch thick oval patty. Place patties on broiler pan coated with cooking spray; broil 4 minutes on each side or until done.

Place 1 cheese slice over each of 4 bread slices. Top each slice with 1 patty and 3 tablespoons onion mixture. Cover with remaining bread slices. Over medium heat, melt 1/2 teaspoon butter in pan coated with cooking spray; add 2 sandwiches to pan. Cook 4 minutes on each side or until browned and cheese melts. Repeat procedure with 1/2 teaspoon butter and remaining sandwiches.

Serves 4

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