These homemade candy bars are reminiscent of your favorite Ben & Jerry’s ice cream – chocolate feuilletine crust and a coffee mousse are layered together for contrasting flavor and crunch. Once the bars have set, cut them into rectangles and top each with a white chocolate cremeux for a decadent, sweet treat.
a 15-by-11-inch ring mold; immersion blender; a piping bag with a small plain round or star pastry tip
For the base: Line a baking sheet with parchment and put a 15-by-11-inch ring mold on top. Spray the parchment and ring mold with cooking spray.
Melt the praline paste and white chocolate in a heatproof bowl set over (but not touching) a saucepan of simmering water, stirring to combine. Fold in the feuilletine. Spread evenly on the bottom of the prepared ring mold. Sprinkle the crushed toffee pieces over the crust. Refrigerate until firm, about 1 hour.
For the mousse: Put the milk chocolate in a large bowl. Bloom the gelatin sheets in a bowl of ice water until soft, about 5 minutes.
Bring the milk, coffee extract, salt and bloomed gelatin to a boil in a medium saucepan. Puree with an immersion blender until smooth, then strain through a fine mesh sieve over the milk chocolate. Let sit for 5 minutes, then stir with a rubber spatula to combine. Allow to cool to 90 degrees F on an instant-read thermometer.
Meanwhile, whip the cream by hand or with an electric mixer on medium speed until it holds a ribbon on the surface when the whisk is lifted.
Fold the whipped cream into the chocolate mixture in 3 additions. Pour over the feuilletine base and smooth evenly with an offset spatula. Allow to set, about 45 minutes, then wrap with plastic wrap and freeze the layered base overnight.
For the cremeaux: Put the white chocolate and glucose syrup in a large bowl. Bloom the gelatin sheets in a bowl of ice water until soft, about 5 minutes.
Bring the cream, milk and bloomed gelatin to a boil in a large saucepan. Strain through a fine mesh sieve over the white chocolate and glucose. Let sit for 2 minutes, then stir with a rubber spatula to combine. Press plastic wrap directly on the surface so it doesn’t form a skin and cover the bowl with another piece of plastic wrap and refrigerate overnight.
Flip the frozen layered base over (still in the ring mold), peel off the parchment and place on another parchment-lined baking sheet. Run a hot knife around the edges of the layered base and lift the ring mold to remove. Let sit at room temperature until it can be cut, 15 to 20 minutes and no more than 30 minutes. Test by touching the center with your fingertip. If it leaves a fingerprint, it’s ready to cut.
Cut into 1-by-4-inch inch bars (or whatever size you want). Whip the cremeux to stiff peaks with an electric mixer on medium-high speed and place in a piping bag with a small plain round or star pastry tip. Pipe the cremeux in small dollops or rosettes on top of each bar.