In 2-quart saucepan, heat milk and butter over medium heat until butter is melted and milk is hot but not boiling. Once hot, remove from heat.
In large bowl, mix together sugar, cinnamon, salt and eggs with wire whisk until well blended.
Mix bread crumbs, egg mixture and blueberries together in large bowl.
Stir in milk mixture until bread is well coated.
Pour into ungreased 8-inch square (2-quart) glass baking dish or 1½-quart casserole.
Place casserole in 13×9-inch pan; pour boiling water into pan until 1 inch deep.
Bake uncovered 40 to 45 minutes or until knife inserted 1 inch from edge of baking dish comes out clean.
For Caramel Whiskey Sauce
In 1-quart heavy saucepan, heat all sauce ingredients to boiling over medium heat, stirring constantly, until sugar is dissolved. Approximately 10-15 minutes until thickened and alcohol has cooked out.
Recipe by You Brew My Tea at https://www.youbrewmytea.com/blueberry-bread-pudding-recipe/