(If you're not using old or stale bread, you can dry it out in the oven first. Place the bread cubes on a baking sheet and bake at 250 degrees F for about 30 minutes, tossing every 10 minutes, until the bread is dry and stale.): The smell of toasting bread will fill your kitchen as moisture leaves the cubes, producing a faintly sweet, warm aroma that promises a better texture. Drying prevents the bread from collapsing into mush, giving the custard something to cling to so pockets of soft custard alternate with slightly chewy bread. Listen for a change in the bread’s sound when you tap a cube with a spoon it should be noticeably firmer and not spongy. A common mistake is crowding the pan; spread cubes in a single layer so air circulates and they dry evenly. If they are still soft in the middle, return them for another 5 to 10 minutes.
Heat oven to 350 degrees F. In a large bowl add half and half, butter, vanilla, sugar and salt. Microwave for about 1 minute, just until butter has melted.: As you warm the half and half and butter , a warm, rich scent will begin to rise, hinting at the custard to come. This gentle warming helps dissolve the granulated sugar and melds the butter with the dairy so you don’t end up with greasy pockets. The visual cue to look for is steam rising and the butter fully incorporated, not boiling. Avoid overheating because scorching will create off flavors and could separate the fat. If you prefer stovetop, warm over low heat while stirring until melted.
Add the beaten eggs and cinnamon to the milk mixture and whisk well to combine.: As you whisk the eggs into the warm dairy, the mixture will take on a glossy, silky appearance and a lightly spiced perfume from the ground cinnamon . Whisk thoroughly to create a homogeneous custard base; streaks of egg indicate under mixing. The reason for mixing now is to temper the eggs gently so they set smoothly during baking, yielding a creamy interior rather than curds. A typical error is adding eggs to very hot liquid which may scramble them, so ensure the dairy is warm not scalding.
Add the bread to the bowl and stir to coat. Pour half of the mixture into a greased baking dish large enough to fit the mixture (any shallow casserole dish; I used a 8 x 11’’ pan).: When the bread meets the custard you will see the cubes begin to glisten as they absorb liquid, and the bowl will feel heavier. Stir gently so all cubes get coated; pressing too hard can break them down. Pouring half into the baking dish creates a layered structure so berries can be distributed between layers for even fruit in each slice. Make sure your dish is greased so the edges do not stick when baking.
Sprinkle half of the raspberries over the top. Pour the remaining bread pudding mixture on top and sprinkle with more raspberries.: The bright red of the raspberries will pop against the pale custard creating appealing visual contrast. The berries will release juices while baking, creating small pockets of concentrated fruit flavor. Distribute them evenly so each portion has a mix of custard soaked bread and fruit. A common pitfall is piling berries only on one side which leads to uneven texture and soggy spots where too much juice accumulates.
Bake for 30 to 45 minutes, or until custard is set but still a little wobbly and edges of bread have lightly browned.: During baking you will notice steam rising and the top gently puffing; the aroma will shift toward baked butter and caramelized sugar. The center should jiggle slightly when nudged this indicates it remains creamy and will set as it cools. The edges turning light golden brown signal that exterior texture is developing. Avoid overbaking which dries out the custard, making it crumbly instead of tender.
Serve warm or at room temperature.: Warm servings deliver the most comforting mouthfeel, the custard silky and the top slightly crisp, while room temperature slices are easier to cut and present nicely. If you add a warm Vanilla Cream Sauce , it will melt into the pudding and heighten the richness. A mistake to avoid is refrigerating the pudding immediately while hot which traps steam and can make the surface soggy; let it rest briefly before covering.
Store leftover bread pudding in the refrigerator for up to 4-5 days.: Once cooled to room temperature, cover the dish or transfer portions to airtight containers; the pudding will keep well and often tastes better the next day as flavors meld. Reheat gently in a low oven or microwave until warm but not piping hot to avoid drying. A pitfall is leaving it uncovered where it can dry out and form an unappetizing crust on top.