Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large mixing bowl, combine the almond flour, rolled oats, coconut sugar, baking soda, and salt. Mix well to combine.
In another bowl, whisk together the melted coconut oil, honey or maple syrup, egg, lemon juice, lemon zest, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and stir until just combined. If using, fold in the slivered almonds and dried cranberries or blueberries.
Using a tablespoon, scoop out the dough and place it onto the prepared baking sheet, spacing them about 2 inches apart.
Gently flatten each cookie with the back of the spoon or your fingers to create a more even shape.
Bake for 12-15 minutes or until the cookies are lightly golden around the edges.
Remove from the oven and let the cookies cool on the baking sheet for about 5 minutes before transferring them to a wire rack to cool completely.
Notes
Serve on a beautiful plate dusted with a light sprinkle of powdered sugar and a lemon slice garnish for added freshness.