Prep the Baking Dish: Generously butter a 9×13-inch baking dish. Arrange the bread slices in the dish in two rows, overlapping if necessary.
Mix the Custard: In a mixing bowl, whisk together the eggs, milk, heavy cream, sugar, vanilla extract, cinnamon, and lemon zest until fully combined.
Assemble: Pour the egg mixture evenly over the bread slices, ensuring all pieces are well coated. Scatter the blueberries over the top, sneaking some between the slices as well.
Refrigerate Overnight: Cover the baking dish tightly with plastic wrap and refrigerate overnight. This allows the bread to soak up the egg mixture, resulting in a more custardy texture after baking.
Bake: The next morning, preheat your oven to 350°F (175°C). Remove the plastic wrap and bake the French toast for 45-50 minutes, or until it’s golden brown and set.
Serve: Let it cool slightly, then dust with icing sugar if using, and serve warm.
Variations & Tips:
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