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Start by whisking together the eggs, half & half, and milk. Add in vanilla extract, cinnamon, and sugar and mix.
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Arrange half of the pieces of bread in a single layer in a 8x8 baking dish. Top half your banana slices all over the bread. Pour half the egg mixture all over the top of this.
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Repeat the layers: bread, banana, then the remaining egg mixture, making sure all the bread is covered.
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Now let this rest in the refrigerator for at least 2 hours or overnight. When you’re ready to bake it, preheat the oven to 350.
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While the oven is preheating, make the crumble for the topping. Mix together ½ cup oats, ½ tsp cinnamon, ¼ cup flour, & 2 tbsp sugar. Now, take the 3 tbsp of cold unsalted butter and cut it into the crumble. Mix together until it forms coarse crumbles. Mix in the pecans.
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Spread this all over the casserole. Bake for 25 min with foil covering the top. Then for another 25 min without the foil. Serve hot with, of course, maple syrup on top!