Coat the insert of a slow cooker with nonstick spray. Line the insert with aluminum foil for easy removal, letting some foil overhand for handles.
Meanwhile, in a large mixing bowl, whisk together the whole milk, sweetened condensed milk, evaporated milk, sugar, vanilla, cinnamon, salt and egg yolks. Toss in the cubed bread and the almonds and mix to coat all the bread.
Add the mixture to the slow cooker, cover and cook on low until the center of the bread pudding is set, about 4 hours. Remove the lid and cool. Use the foil handles to lift the bread pudding from the slow cooker. Drizzle individual servings with Cinnamon Sugar Sauce and top with freshly whipped cream.
In a heavy-bottomed saucepan, combine the sugar, butter, buttermilk, corn syrup, vanilla and cinnamon and salt and bring to a boil over medium-high heat. Remove from the heat and slowly add the baking soda. At first the sauce will bubble up, just keep stirring. Sauce will thicken as it cools.
Cook's Note: This syrup is a great addition to pancakes, waffles or any dessert.