Butter a 9x13-inch baking dish and set aside. Up to 2 days before serving, mix the eggs, cream, milk, sugar, vanilla, cinnamon and salt with a whisk to form the custard base. Fold in the chewy bread. Pour the contents into a buttered casserole dish, cover with plastic wrap and refrigerate for at least 2-3 hours, overnight is best.
To bake, preheat oven to 350°F. Pull casserole from the fridge, remove the plastic wrap and sprinkle blueberries on top. Tuck and fold them into the bread gently, so they don't get crushed. Dot the top with butter then let sit on the counter for 10 minutes to take the chill off. Bake for 35-45 minutes until the casserole is puffed and golden. Top with syrup, toasted pecans and whipped cream.
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