Banana and Grand Marnier French Toast Casserole

Grand Marnier French toast casserole fresh from the oven

I love a great, delicious breakfast. Even better when it’s really easy to prepare. And best when all the preparation is done the night before, so all you have to do is enjoy it in the morning. Sounds pretty great, right? Here’s my super easy overnight French Toast casserole recipe. It’s amazing.

And it’s a Grand Marnier French Toast. And a baked banana French Toast – kind of like banana bread and French Toast together. Oh, and I throw in some fresh blueberries and chocolate chunks. Because delicious. Like seriously, SO good! Especially when you drizzle maple syrup over it all.

French Toast casserole served in bowl

Maybe you love French Toast but don’t want to take the time to individually pan-fry each slice of bread. Especially if you’re making it for a large group. This is why I like making it as a casserole. Throw it all in a baking dish and let the oven do its thing. Perfect, delicious French Toast. Meanwhile you can go take a shower, have a coffee or watch TV. Do anything, except for worrying about making breakfast.

So next time you’re hosting a brunch, or even just want a lazy Sunday morning, make this Grand Marnier French Toast casserole ahead of time. Prepare it the night before, refrigerate overnight, and just throw it in the oven in the morning. Easy. Delicious. Breakfast.

French toast casserole before baking

If you don’t have overly-ripe bananas ready when you want to make this, here’s an awesome tip I found on One Good Thing by Jillee. You can bake your full, unpeeled bananas in the oven at 300°F (mine took about 25 minutes), and they will become perfectly delicious, soft and ready for baking. This is an awesome tip no matter what you’re making – banana bread, muffins or my French Toast.


Banana and Grand Marnier French Toast Casserole

  • 1 loaf sourdough bread cut into 1 inch cubes
  • 3 medium very ripe bananas
  • 6 eggs
  • 2 cups milk
  • 1 cup heavy cream
  • 1/4 cup brown sugar
  • 2 tsp vanilla extract
  • 1 tsp cinnamon powder
  • 1/2 tsp salt
  • 1/4 cup Grand Marnier
  • 1 cup blueberries
  • 1/2 cup chocolate chunks or more to taste
  • 3 tbsp butter cut into pieces
  1. Fill a greased 9x13 baking dish with the bread cubes.

    If using a fresh loaf of bread, you can let the bread sit out in the baking dish for a few hours after cutting it into cubes. You want the bread to dry out some, as this will let it more easily soak up the French Toast mixture and flavours.

  2. In a large mixing bowl mash the bananas.

    If the bananas are not as ripe as you would like them, you can bake them unpeeled in the oven at 300°F until they are very dark (almost black) and shiny. Mine took about 25 minutes.

  3. Add the eggs, milk, heavy cream and brown sugar to the mixing bowl with the bananas and whisk until well combined. Stir in the vanilla extract, cinnamon, salt and Grand Marnier.

  4. Pour the mixture over the bread cubes in the baking dish. Cover with plastic wrap and place in the refrigerator overnight (or at least an hour).

  5. Preheat an oven to 350°F.

  6. Top the French Toast casserole with blueberries and chocolate chunks. Dot with pieces of butter.

  7. Bake uncovered in the oven for 40 to 45 minutes until the bread is golden on top.

  8. Remove from the oven and let cool for 5 minutes.

    Serve with maple syrup and enjoy!


If you try this recipe, please let me know! Leave a comment and share a picture using #thesliceabove on Instagram. I always love seeing what you cook!

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