3 (4 oz.) sticks of unsalted butter or margarine (melted)

2 cups dark brown sugar

1 cup white sugar

2 eggs

2 egg yolks

2 tablespoons pure vanilla extract

4 cups all purpose flour

1 teaspoon baking soda

1 teaspoon salt

2 bags chocolate chips

1 cup rice crispies.

Preheat oven to 325 degrees F (165 degrees C). 

• Line cookie sheets (I love non-stick silicone baking mats)
• Mix the flour, baking soda and salt in a medium sized bowl. 
•  set aside.
• In an electric mixer or large bowl, cream together the melted butter, brown sugar and white sugar until blended.
•  Add vanilla, egg, and egg yolk until well incorporated.
• Mix in the dry ingredients until just blended. Stir in the chocolate chips and rice crispies.
• Use a cookie scooper or spoon to drop cookie dough (rolled into 1 inch balls) onto the prepared cookie sheets. Cookies should be about 2 inches apart.
• Bake for 13-15 minutes in the preheated oven, or until the edges are lightly browned.
• Let cool on baking sheets for 10 minutes, then transfer to wire racks to cool completely.