Preheat the Oven:

• Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper or lightly grease it.

Mix Wet Ingredients:

• In a large bowl, cream together the butter, brown sugar, and granulated sugar until light and fluffy. You can do this with an electric mixer or by hand using a whisk.

• Add the eggs one at a time, beating well after each addition.

• Stir in the vanilla extract.

Mix Dry Ingredients:

• In a separate bowl, whisk together the oats, flour, baking soda, salt, and cinnamon (if using).

Combine Wet and Dry Ingredients:

• Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.

Add Chocolate Chips and Nuts:

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

Form the Cookies:

• Drop tablespoon-sized scoops of cookie dough onto the prepared baking sheet, spacing them about 2 inches apart. You can use a cookie scoop or simply spoon out the dough and roll it into balls.

Bake:

• Bake the cookies in the preheated oven for about 8-10 minutes, or until the edges are golden brown but the centers are still soft. Keep an eye on them, as baking time may vary depending on your oven.

Cool:

• Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.