Soft, buttery avocado amps up the irresistible gooeyness of this grilled cheese. Tomato brings a bright, acidic contrast to the richness of cheese and avocado. Firm, ripe tomatoes will perform best--giving off some, but not too much, juice as the sandwich grills.
Serves 4 (serving size: 1 sandwich)
1. Sprinkle 3 tablespoons cheddar cheese over each of 4 bread slices. Top each with 2 tomato slices. Arrange avocado slices evenly over tomato slices. Sprinkle evenly with salt and pepper. Top with remaining 4 bread slices. Lightly coat outsides of sandwiches with cooking spray.
2. Heat a grill pan over medium heat. Place sandwiches in pan; cook 3 minutes on each side or until bread is toasted and well marked and cheese melts. Cut each sandwich in half; serve immediately.