I recently learned about this recipe from a local recipe group I am a member of on Facebook. No need to recreate the wheel here -- I'm just going to point you in the direction of the original recipe. I didn't make any major tweaks except for using the French bread I had on hand and cutting the recipe in half. I also didn't use as much cream cheese as they called for, but this is something you could eyeball. Oh! And I used frozen organic blueberries that I thawed in the sink. Everything else I kept the same.
Overnight Blueberry French Toast
Recipe HERE from allrecipes.com
A quick note on halving the recipe like I did -- it fit perfectly into an 8x8 glass pan, and it fed us for three mornings (two adults and a toddler). So, unless you're feeding a much larger crowd, I feel very confident you could easily halve the recipe and have plenty!
Girlfriend-to-girlfriend note: if you don't have an 8x8 glass dish with a coordinating lid, then check HERE for the deal of the century. This is Prime eligible on Amazon, a great brand, so inexpensive too. I love cooking entrees, side dishes, or casseroles in mine and then just being able to slap the lid right on the leftovers and stick it in the fridge ... no messing with Saran wrap or trying to find a lid to the only Tupperware in your house that will fit your leftovers!