In a medium bowl, whisk together the flour, baking soda, baking powder, and salt.
In a large bowl, using an electric mixer, beat the butter until creamy. Add the sugar and beat until light and fluffy. Add the vanilla and eggs, and mix until blended.
Add the dry ingredients to the wet ingredients and mix until blended.
Stir in the oats, chocolate chips, and walnuts.
Drop the dough by heaping tablespoons onto an ungreased cookie sheet.
Bake for 12-15 minutes, or until golden brown.
Let the cookies cool on the cookie sheet for 5 minutes.
Transfer the cookies to a wire rack to cool completely.
Interesting Facts
Cowboy Cookies Dunkin Platter is a great snack for adults and kids alike.
This recipe is a great way to use up leftover oats and nuts.
The secret to making these cookies extra crunchy is to use old-fashioned oats instead of quick oats.