Creating Savory Gruyere and Leek Bread Pudding is straightforward when following these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
2. Sauté the Leeks: In a skillet, melt the butter over medium heat. Add the sliced leeks and sauté until they are soft and lightly caramelized, about 8-10 minutes.
3. Prepare the Bread: In a large bowl, combine the cubed bread and sautéed leeks. Mix in the shredded Gruyere cheese, ensuring even distribution.
4. Make the Custard: In another bowl, whisk together the eggs, milk, heavy cream, Dijon mustard, salt, and pepper until well combined.
5. Combine Ingredients: Pour the custard mixture over the bread and leek mixture. Gently stir until the bread is fully soaked, allowing it to absorb the liquid.
6. Transfer to Baking Dish: Pour the mixture into the prepared baking dish, spreading it evenly.
7. Bake: Place in the preheated oven and bake for 40-45 minutes or until the top is golden brown and the custard is set.
8. Cool: Remove from the oven and let it cool for 5-10 minutes before serving.
9. Garnish: If desired, sprinkle fresh thyme leaves on top for a pop of color and flavor.

By following these steps, you’ll create a delicious Savory Gruyere and Leek Bread Pudding that will impress your family and friends!