Coat a 9 x 13-inch (23 x 33 cm) baking dish with cooking spray, then add the almond flour, softened butter, granulated sugar, almond extract and eggs to the bowl of a stand mixer and beat until creamy, stopping to scrape down the bowl as needed. Add the all-purpose flour and mix again until the almond cream is soft enough to pipe but thick enough to stay in a mound when it comes out of the piping bag, then set aside.
cooking spray, 2¼ cups (216 g) almond flour, ¾ cup (170 g) unsalted butter, ¾ cup (150 g) granulated sugar, 1½ tsps (7 ml) almond extract, 3 large eggs, 3 tbsps (24 g) all-purpose flour
Preheat the oven to 350°F (177°C), then whisk the eggs, whole milk, heavy cream, melted and cooled butter, granulated sugar, brown sugar, cinnamon, vanilla extract, almond extract and nutmeg together in a large bowl until completely mixed and no streaks of egg white remain.
6 large eggs, 2 cups (480 ml) whole milk, 1 cup (240 ml) heavy whipping cream, 6 tbsps (85 g) salted butter, ¼ cup (50 g) granulated sugar, ½ cup (110 g) light brown sugar, 1 tsp (3 g) ground cinnamon, 1 tsp (5 ml) vanilla extract, 1 tsp (5 ml) almond extract, ¼ tsp (0.5 g) ground nutmeg
Tear the bread into large pieces and place half in the prepared baking dish, then pour half of the custard evenly over the bread and let it soak in briefly, pressing down lightly on any pieces that remain dry on top without mashing the bread into the custard.
1 lb (454 g) Italian country loaf
Transfer the almond cream to a piping bag fitted with a wide opening and pipe it over the soaked bread, spreading it around the dish so most of the almond cream isn’t concentrated in one area.
Add the remaining bread and pour the remaining custard evenly over it, then scatter the sliced almonds across the top and press a few down between the pieces of bread.
½ cup (43 g) sliced almonds
Let the assembled bread pudding rest for 10 minutes so the bread can absorb the custard, then cover the dish loosely with foil and bake for 45 to 50 minutes, removing the foil for the final 5 minutes. The bread pudding is done when the center is puffed and set and you don’t see loose custard moving when the pan is lightly nudged.
While the bread pudding finishes baking, melt the butter in a small saucepan and stir in the brown sugar until smooth, then add the vanilla and heavy cream and whisk until the glaze is completely mixed.
8 tbsps (113 g) salted butter, 3 tbsps (40 g) light brown sugar, 1½ tsps (7 ml) vanilla extract, 2 tbsps (30 ml) heavy whipping cream
Pour the warm brown sugar glaze evenly over the bread pudding while it is still warm, then let the bread pudding rest for about 10 minutes before serving.