The cinnamon-raisin bread adds a touch of sweetness to the creamy Gruyere cheese, the apples add a little crunch and pop of tartness, and the thyme gives it freshness with just a tease of its flavor, just enough to make this sandwich special.
Spread butter on 1 side of each slice of bread; flip, so that buttered sides are facing down. Top 2 slices of bread with apple slices, 1/3 cup Gruyere cheese, and a sprinkle of thyme leaves. Place the other 2 slices of bread on top, buttered sides facing up.
Heat a large skillet over medium-low heat. Add sandwiches to the hot pan and cook until bread has toasted and cheese has slightly melted, 4 to 5 minutes. Flip carefully using a spatula, pressing down lightly. Cook sandwiches until golden brown and cheese has melted, 3 to 4 minutes more, watching and adjusting heat if necessary to keep bread from burning before cheese has melted.
Transfer sandwiches to a plate, slice in 1/2 diagonally, and serve immediately.
Per Serving: 497 calories; protein 24g; carbohydrates 53.2g; fat 24.7g; cholesterol 64.5mg; sodium 409mg.