Preheat your oven to 350°F and line a baking sheet with parchment paper.
Combine ingredients: Place the almond flour, egg, sea salt, pepper, and fresh rosemary in the bowl of a food processor. Pulse until a dough forms and pulls away from the sides of the bowl (about 30-45 seconds).
Roll out the dough: Place the dough between two sheets of parchment paper. Using a rolling pin, roll the dough to about 1/16-inch thickness. The thinner you roll it, the crispier your crackers will be.
Cut into squares: Using a rolling pizza cutter or sharp knife, cut the dough into 2-inch squares. You can also use cookie cutters for fun shapes if desired.
Season (optional): Sprinkle the cut crackers with additional sea salt and pepper if you'd like extra seasoning.
Bake: Transfer the parchment paper with the cut crackers directly onto your prepared baking sheet. Bake for 10-13 minutes, until the edges are light golden brown. Keep a close eye during the last few minutes—they can go from perfectly golden to too dark quickly.
Cool completely: Let the crackers cool on the baking sheet. They'll continue to crisp up as they cool. Once completely cooled, break apart along the cut lines.
Store in an airtight container at room temperature for up to 5 days, or in the refrigerator for up to 2 weeks.