Preheat oven to 450°F. Line a baking sheet with parchment paper and set aside.
In a large bowl, stir together 1 cup almond flour (105 g), 1/4 cup coconut flour (25 g), 4 1/2 tablespoons monk fruit sweetener, 2 tablespoons cinnamon powder, and 1/4 teaspoon salt until evenly combined.
Add the egg white (from 1 large egg) and 2 tablespoons melted coconut oil. Mix with a spoon briefly, then use your hands to press the mixture together until it is moistened and can be packed into a ball.
Divide the dough into two equal portions. Place one portion between two large pieces of parchment paper and roll it out very thinly, about 1/16 inch thick (under 2 mm).
Remove the top piece of parchment, then cut the rolled dough into 3/4-inch squares. Use a thin spatula or bench scraper to gently transfer the squares to the prepared baking sheet, spacing them slightly apart. Repeat steps 4–5 with the remaining dough.
Evenly sprinkle the remaining 2 teaspoons monk fruit sweetener over the squares.
Bake in the preheated oven until the squares just turn golden brown, 5 to 8 minutes—watch them closely, as they burn quickly (many ovens yield perfect results at 6–7 minutes). They will not be crunchy when you remove them.
Let the squares cool completely on the baking sheet; they will crisp as they cool. Then enjoy.