Bread Pudding w/ Bourbon Sauce

Pictured is 1/3 batch soaking before cooking.

2 tablespoons light brown sugar
3/4 cup plus 1 tablespoon granulated sugar (5 1/4 ounces)
1(14-ounce) loaf challah bread, cut into 3/4-inch cubes (about 10 cups) (see note)
9 large egg yolks
4 teaspoons vanilla extract
3/4 teaspoon table salt
2 1/2 cups heavy cream
2 1/2 cups milk
2 tablespoons unsalted butter , melted

(I choose to divide the recipe by 3 to make a smaller batch)

1. Adjust oven racks to middle and lower-middle positions and heat oven to 325 degrees. Combine brown sugar and 1 tablespoon granulated sugar in small bowl; set aside.

2. Spread bread cubes in single layer on 2 rimmed baking sheets. Bake, tossing occasionally, until just dry, about 15 minutes, switching trays from top to bottom racks halfway through. Cool bread cubes about 15 minutes; set aside 2 cups.

3. Whisk yolks, remaining 3/4 cup sugar, vanilla, and salt together in large bowl. Whisk in cream and milk until combined. Add remaining 8 cups cooled bread cubes and toss to coat. Transfer mixture to 13 by 9-inch baking dish and let stand, occasionally pressing bread cubes into custard, until cubes are thoroughly saturated, about 30 minutes.

4. Spread reserved bread cubes evenly over top of soaked bread mixture and gently press into custard. Using pastry brush, dab melted butter over top of unsoaked bread pieces. Sprinkle brown-sugar mixture evenly over top. Place bread pudding on rimmed baking sheet and bake on middle rack until custard has just set, and pressing center of pudding with finger reveals no runny liquid, 45 to 50 minutes. (Instant-read thermometer inserted into center of pudding should read 170 degrees.) Transfer to wire rack and cool until pudding is set and just warm, about 45 minutes. Serve.
While the Bread pudding is cooling begin your bourbon sauce.

Bourbon Sauce:
1/2 cup light brown sugar
7 tablespoons heaving whipping cream
2 1/2 tablespoons unsalted butter
1 1/2 tablespoons bourbon

In Sauce pan over medium heat whisk together the sugar and heavy cream and cook till this mixture comes to a boil, about 5 minutes.
Add the unsalted butter and continue cooking till the mixtures comes to a boil again. about 1 minute.
Turn heat off and add the bourbon and whisk together to combine well. Let the mixture sit till cooled but still warm.