Chop the bread or pastries into approximately 1 inch cubes, set aside.
In a medium mixing bowl, combine the egg, sugar, milk, and vanilla, & gently whisk together.
Toss the bread cubes into the liquid mixture until fully moistened.
Transfer the bread pudding base into a round or square baking dish or cake pan (approximately 8-9 inches, metal, glass, or ceramic is fine.)
Top the bread pudding base with your frozen berry blend. Frozen berries do work better than fresh, they hold up better to the longer bake time.
Cover baking dish with aluminum foil and bake at 350 degrees for 40 minutes, turn the pan and remove the foil halfway through the bake time.
Serve warm or chilled, with whipped cream, ice cream, clotted cream, fruit sauces, or just as is!