Overnight Berry French Toast Casserole
A make-ahead breakfast casserole featuring cubed Hawaiian bread soaked in an eggy custard studded with fresh strawberries and blueberries. This version uses a mix of granulated and brown sugar for deeper caramel notes, with warm cinnamon spice throughout. Perfect for feeding a crowd at brunch or weekend breakfast without morning fuss. The overnight chill allows flavors to meld while the bread absorbs the creamy custard, yielding either a tender center (30 minutes) or firmer texture (40 minutes) depending on preference.
Ingredients
Instructions
- 1
Spray a 9-by-13 casserole dish with cooking spray.
- 2
Chop strawberries into bite-sized pieces.
- 3
Tear bread into chunks and distribute half evenly across the dish bottom.
- 4
Layer half the blueberries and strawberries over the bread.
- 5
Top with remaining bread chunks and berries.
- 6
Whisk together eggs, milk, both sugars, vanilla, and cinnamon in a large bowl.
- 7
Pour custard mixture over bread and berries.
- 8
Cover with plastic wrap and refrigerate overnight or minimum 2 hours.
- 9
Preheat oven to 350F (350°F).
- 10
Bake uncovered for 30 to 40 minutes until set, choosing timing based on desired texture.
- 11
Cool briefly before serving with syrup, honey, or whipped cream.
Tips
For best results, use slightly stale or day-old bread to prevent mushiness. Fresh bread will absorb liquid too quickly.
Make this through step 7 up to 2 days ahead. The extended chill deepens cinnamon-sugar flavor and ensures even custard absorption.
Bake 30 minutes for custardy, soft centers or 40 minutes for firmer, more structured slices that hold their shape.
Good to Know
Cover and refrigerate up to 2 days before baking. After baking, store covered in fridge up to 3 days. Reheat gently at 325F.
Assemble through step 7 up to 2 days in advance. Do not bake until ready to serve.
Warm with maple syrup, honey, berry compote, whipped cream, or Greek yogurt. Serves 6-8.
Common Mistakes
Do not skip the overnight chill to avoid dry, undersaturated casserole.
Do not use very fresh soft bread to prevent a mushy, falling-apart result.
Do not exceed 40 minutes baking to avoid a tough, rubbery custard layer.
Substitutions
Dairy-Free Swaps
Vegan Options
General Alternatives
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FAQ
Can I assemble this the morning of and bake that day?
Yes, but chill minimum 2 hours. The overnight soak is ideal but not mandatory. Shorter chill times yield less custard absorption and softer bread.
What if I don't have fresh berries?
Frozen berries work well. Thaw and drain excess liquid first to prevent a soggy casserole. You can also substitute with diced peaches, diced apples mixed with extra cinnamon, or dried cranberries.
How long can I keep leftovers?
Refrigerate covered up to 3 days. Reheat gently at 325F for 10-15 minutes. Do not freeze, as the custard texture becomes grainy upon thawing.