This easy brioche French toast casserole can be baked immediately, or held overnight, with tasty optional fruit and cinnamon crumb topping!
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Quick-stale bread if needed in a 200°F oven for 10 minutes.
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Cube bread slices in about 1" pieces (roughly 3x3 per slice).
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Mix all batter ingredients together until fully combined.
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Gently toss the bread pieces in the batter until all liquid is absorbed.
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Transfer bread to a greased 9" x 13" pan and spread into an even layer.
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Cover pan with aluminum foil. Rest mixture for 1 hour or overnight.
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Stir together all the dry streusel ingredients. Mix in butter until large clumps form.
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When ready to bake, uncover casserole and sprinkle fruit evenly overtop of the bread, if using.
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Sprinkle streusel evenly over top of the bread and fruit.
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Bake covered for 30 minutes, then uncovered for 15 more minutes. Cool slice and enjoy!