Preheat oven to 275° F.

Spread bread cubes into a single layer on a baking sheet and slide into the oven to dry out, for about 15 to 20 minutes. Once dry, remove from oven and set aside. (If bread is sufficiently stale, you may omit this step; alternatively, you can use fresh bread and omit this step as well, which will yield a much more pudding-y pudding -- the cube shape of the pieces will disappear entirely. Do what you like.)

While the bread is drying, whisk the milk, cream, sugars, eggs, vanilla, cinnamon, and nutmeg together until smooth.

Increase oven temperature to 350° F and grease an 8-inch round pan or another small, oven-safe dish.

Dump dried bread cubes into a large bowl with the eggy mixture and mix to coat. Allow the mess to hang out for 20 minutes so the bread can soak up as much of it as possible. Fold in the raspberries, and then pour the prepared pan.