Grilled Cheese and Avocado Sandwich

Directions

1. Spread 3 tablespoons butter on 1 side of bread slices. Place bread, butter side down, in a large cast-iron skillet or on an electric griddle over medium-low heat until golden brown, 2-3 minutes; remove. In a small bowl, combine cheddar, Monterey Jack and Gruyere. In another bowl, mix together remaining 3 tablespoons butter, mayonnaise, Manchego cheese and onion powder.
2. To assemble sandwiches, top toasted side of 4 bread slices with sliced Brie; add avocado slices. Sprinkle cheddar cheese mixture evenly over avocado slices. Top with remaining bread slices, toasted side facing inward. Spread the butter-mayonnaise mixture on the outsides of each sandwich. Place in same skillet and cook until golden brown and cheese is melted, 5-6 minutes on each side. Serve immediately.