Unbelievable Blueberry French Toast Casserole

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Ingredients

1 (12–14-ounce/340–400g) loaf of sturdy day-old bread, such as French bread, sourdough, brioche, or challah, cut in 1-inch cubes*
1 cup (140g) fresh or frozen blueberries
2 cups (480g/ml) whole milk
8 large eggs
1/2 cup (120g/ml) heavy cream
1/2 cup (100g) packed light brown sugar
2 teaspoons pure vanilla extract
2 teaspoons ground cinnamon
1 teaspoon fresh lemon zest
pinch of salt
1/3 cup (67g) packed light or dark brown sugar
1/3 cup (42g) all-purpose flour (spooned & leveled)
1/2 teaspoon ground cinnamon
6 Tablespoons (85g) unsalted butter, cold and cubed
optional: extra blueberries, maple syrup, and/or confectioners’ sugar for topping

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