Preheat the oven to 350°F and line an 18”x13” (or similar size) baking sheet with parchment paper.
On top of the parchment paper place the graham crackers in a single layer, covering the entire sheet, set aside.
In a medium sized saucepan add the butter and brown sugar.
Over medium-low heat, stirring constantly, melt the butter and sugar together to create a caramel mixture. Bring the caramel to a boil and let boil undisturbed for 1 minute.
Carefully (it will be very hot!) pour the caramel mixture over top of the graham crackers. Using a spatula spread the caramel evenly to cover all of the crackers.
Sprinkle the sliced almonds on top of the caramel.
Bake for 8-10 minutes until bubbly and deep golden brown.
Remove from the oven and let cool to room temperature. After it has cooled to room temperature, transfer the tray to the refrigerator to set for at least 4 hours, or overnight.
Sprinkle with flaky salt (optional), break apart and enjoy!
Notes
- use a pizza cutter to cut the almond florentine after it has fully cooled.