Spray an 8- inch square baking dish with cooking spray. In a small bowl, cover raisins with hot water and soak for 10 minutes.
2Butter the bread, remove crusts and cut each slice in half diagonally. Arrange half of the bread, buttered side up, in the prepared pan. Drain the raisins and sprinkle over bread. Arrange remaining bread over the raisins.
3Stir milk, 1 cup cream, granulated sugar, cinnamon and nutmeg in medium saucepan over medium heat until mixture begins to boil, 5 to 7 minutes; stirring constantly. Remove from heat and whisk in vanilla extract and beaten eggs. Pour custard over bread, cover with aluminum foil and let sit for 10 minutes before placing in the oven.
4Place covered dish in a 13 x 9- inch baking pan. Place the pan in the oven and pour enough hot water into pan to come 2/3 up the sides of the baking dish. Bake until custard is set, 50 to 55 minutes. Remove the foil covered pudding from the oven leaving the water-filled pan to cool inside the oven before removing.
Stir 1 3/4 cups cream in a small heavy saucepan over medium heat until liquid just begins to boil. Remove from heat.
Whisk 2 tbsp granulated sugar and egg yolks in a small bowl until light and fluffy. Whisk egg mixture into cream. Place pan over low heat and stir constantly until sauce thickens, about 10 minutes. Stir in whiskey. Spoon warm sauce over each serving of pudding.