1Preheat your oven to 350°F (175°C).
In a medium bowl, combine the flour, oats, baking soda, salt, and cinnamon. Set aside.
In a large bowl, cream together the butter, granulated sugar, and brown sugar until light and fluffy.
Add the vanilla extract, lemon juice, and eggs to the butter mixture, and beat until well combined.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Stir in the chocolate chips and chopped walnuts.
Drop cookie dough by rounded tablespoons onto ungreased baking sheets, spacing them about 2 inches apart.
Bake in the preheated oven for 10-12 minutes, or until the edges are golden brown and the centers are set.
Allow the cookies to cool on the baking sheets for a few minutes before transferring them to wire racks to cool completely.
Enjoy your homemade Doubletree Chocolate Chip Cookies!