Preheat your oven to 350°F. Line a baking sheet with parchment paper.
In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
In a large bowl, cream the softened butter and granulated sugar together until light and fluffy, about 2-3 minutes.
Add the honey, egg, and vanilla extract to the butter mixture, and mix until well combined.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Fold in the dried lavender, rolled oats, and nuts if using.
Drop tablespoon-sized portions of the dough onto the prepared baking sheet, spacing them about 2 inches apart.
Sprinkle the tops of the cookies with coarse sugar.
Bake for 10-12 minutes, or until the edges are lightly golden.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.