Step 1

Preheat oven to 350ºF. Prepare baking sheets by lining them with parchment paper or nonstick baking mats.

Step 2

In a large bowl, using a hand mixer or stand mixer with the paddle attachment, cream together the butter, sugars, eggs, and vanilla until smooth.

Step 3

Stir together the flour, baking soda, and salt in a separate small or medium bowl.

Step 4

Add the flour mixture to the wet ingredients and mix until combined, scraping the sides of the bowl as needed.

Step 5

Mix in the oats until combined.

Step 6

Mix in the chocolate chips, chopped chocolate and walnuts.

Step 7

Using a cookie scoop, drop cookie dough balls onto prepared cookie sheets. Flatten slightly with the bottom of a glass if you'd like the cookies to be flatter.

Step 8

Sprinkle the tops with coarse sugar if desired, or press a few chocolate chips into the top of the cookies before baking. This makes them extra pretty.

Step 9

Bake 10 minutes. Don't overbake.

Step 10

Let them cool for 2-3 minutes on the cookie sheets before them to a wire rack to cool completely.

Step 11

Store in an airtight container at room temperature for up to 5 days. Freeze cookies for up to 8 weeks.