1. Prepare the Bread

Start by cutting the day-old bread into 1-inch cubes. Using stale or slightly dry bread is ideal because it absorbs the custard mixture better without becoming overly soggy. If your bread is fresh, you can dry it out by toasting the cubes in a 300°F (150°C) oven for about 10 minutes.

2. Make the Custard

In a large mixing bowl, whisk together the eggs, whole milk, heavy cream, granulated sugar, vanilla extract, and ground cinnamon. Ensure that all the ingredients are well combined, creating a smooth custard mixture. This step is crucial, as the custard is what gives the muffins their rich, creamy texture.

3. Soak the Bread

Add the bread cubes to the custard mixture, gently stirring to ensure that every piece is well coated. Let the bread soak for at least 10 minutes to allow it to absorb the liquid fully. This step ensures the muffins are soft and flavorful throughout. If the bread is particularly dry, you can let it soak for a few extra minutes.

4. Preheat the Oven

Preheat your oven to 350°F (175°C). Grease a 12-cup muffin tin or line it with paper liners to prevent sticking. Properly preparing the muffin tin makes removing the muffins easier after baking.

5. Fill the Muffin Tin

Evenly divide the soaked bread mixture among the muffin cups, pressing down lightly to compact the mixture. This step helps the muffins hold their shape as they bake. Do not overfill the cups, as the mixture will expand slightly in the oven.

6. Prepare the Cinnamon Sugar Topping

In a small bowl, mix together the granulated sugar and ground cinnamon. Drizzle the melted butter over the top of each muffin, then generously sprinkle the cinnamon sugar mixture on top. This creates a sweet, slightly crispy topping that enhances the overall flavor of the muffins.

7. Bake the Muffins

Place the muffin tin in the preheated oven and bake for 20 to 25 minutes, or until the muffins are golden brown and set. A toothpick inserted into the center should come out clean, indicating they are fully cooked. If they seem underdone, bake for an additional 2 to 3 minutes while keeping a close eye on them.

8. Cool and Serve

Allow the muffins to cool in the pan for a few minutes before transferring them to a wire rack to cool completely. This helps them set properly and prevents them from falling apart. Serve warm or at room temperature. For an extra indulgence, drizzle with maple syrup or serve with fresh fruit.