Preheat your oven to 350°F (175°C).

Grind the rolled oats in a food processor or blender until fine.

In a medium bowl, combine the ground oats with the flour, baking soda, salt, and cinnamon. Mix well and set aside.

In a large bowl, cream together the softened butter, brown sugar, and granulated sugar until smooth and creamy.

Add the vanilla extract, lemon juice, and eggs to the butter-sugar mixture. Mix until well combined.

Gradually add the dry ingredient mixture to the wet ingredients, mixing until just combined.

Fold in the chocolate chips and chopped walnuts (if using) until evenly distributed throughout the dough.

Using a cookie scoop or spoon, drop rounded tablespoons of dough onto ungreased baking sheets, spacing them about 2 inches apart.

Bake in preheated oven for 10-12 minutes, or until the edges are golden brown.

Remove from oven and let cool on baking sheets for 2 minutes before transferring to wire racks to cool completely.

Serve warm