S'mores Cookie Bars

Preheat oven to 350 F. Line a 9x13 baking pan with parchment paper, or spray with cooking spray and set aside.
Place butter and sugars together in a large mixing bowl fitted with a paddle attachment. Beat on medium-high for 3-4 minutes until light and fluffy.
Add eggs one at a time, mix until smooth on low speed, about 30 seconds each egg. Beat in the vanilla.
Add soda, salt, graham cracker crumbs and flour and mix on low until incorporated.
Press cookie dough into the bottom of the 9x13 baking pan.
Bake for about 16-18 minutes. The middle of the cookie base should still look slightly doughy and glossy, but the edges should look done.
Remove from the oven and top with marshmallows. Return to the oven for about 3-4 minutes, until they are all puffed. You can throw under the broiler if you want, or use a kitchen torch after to get some parts more browned.
Top the cooked and warm marshmallows with hershey squares, or even chocolate chips.
Allow to cool before cutting into them.