Bread Pudding with Rum with nuts

nonstick cooking spray 1 lb purchased brioche bread 5 cups cold whole milk 2 (4 1/2 ounce) boxes jello brand american custard mix 1/3 cup dark rum 2 egg[...]

7 cups bread, slightly stale and cut into 1-inch cubes 3/4 cup raisins 2 cups milk 4 eggs , beaten 1/2 cup sugar 1 teaspoon vanilla 1/4 cup melted butter 1[...]