Spray a 9 x 13-inch baking pan with cooking spray. Tear French bread into chunks, or cut into cubes, and evenly place in the pan.: The moment you prepare the pan you should notice a subtle sheen across the metal, which ensures the baked custard releases cleanly and the crust remains intact when you slice. When I press my fingertip lightly on the oiled surface, there is a slickness that tells me the pan is ready. This step matters because sticking ruins presentation and makes serving awkward. A common mistake is skimming oil only in the center, which leaves edges stuck; be thorough and coat all corners evenly.
In a large bowl, mix together eggs, milk, cream, sugar, and vanilla extract. Pour evenly over bread. Cover pan with saran wrap and store in the refrigerator for several hours or overnight.: As you arrange the French Bread , aim for an even layer so the custard soaks uniformly. You should hear the soft thud of bread hitting the pan and see a patchwork of crust and crumb that will brown differently. I like to leave some larger pieces for a chewy bite and smaller cubes for fully soaked pockets. Avoid smashing the bread down; compressing it prevents proper absorption and can make the interior gummy.
In a separate bowl, mix together flour, brown sugar, cinnamon, and salt. Add butter pieces and cut into the dry mixture using a fork or your hands. Combine until the mixture resembles sand with a few pea sized chunks. Cover and store mixture in the refrigerator.: When whisking the custard components, watch for a smooth pale yellow mixture that smells bright with vanilla and sweet with sugar. Pour slowly so the liquids nestle into air pockets rather than washing some pieces clean and missing others. Covering and chilling allows the liquids to penetrate thoroughly which deepens flavor, and you should see the bread darken as it soaks. A frequent error is skipping the chill step which results in an under soaked center and drier texture.
When you’re ready to bake the French toast, preheat oven to 350 degrees. Remove casserole from refrigerator and sprinkle crumb mixture over the top. Bake for 45-55 minutes, or until the French toast is set and golden brown.: As you combine these dry ingredients, the aroma of cinnamon and brown sugar will start to bloom. Adding cold butter and cutting it in produces a sandy mixture that should clump slightly when pinched. Refrigerating keeps the butter firm so those pea sized chunks remain intact during baking, creating crisp pockets. If your butter gets too warm while working, pop the bowl in the fridge briefly, because greasy, melted topping will spread rather than crisp.
Serve warm with maple syrup.: When the oven reaches the correct temperature you should notice a steady warmth, and as the casserole bakes you will see the edges puff slightly and the top turn a warm golden brown. The scent will deepen into caramelized sugar and butter, and a gentle jiggle in the center should be absent when it is set. This mid length bake develops both a creamy interior and a crunchy topping, and underbaking yields a wet center while overbaking dries the custard, so watch closely in the final ten minutes and test with a clean knife in the center.
Serve warm with maple syrup: As you plate the slices, steam will rise and the surface will glisten where the crumb browned, inviting you to drizzle Maple syrup . The syrup brings a glossy finish and an extra layer of sweet complexity. Serve immediately to preserve contrast between warm interior and crisp top, because letting it sit will soften the crumbs. A typical misstep is adding syrup before slicing which creates soggy spots; pour at the table instead so each guest controls their portion.