Preheat oven to 350 degrees

Combine flour, baking soda, and salt in a bowl.

Beat butter, sugars and vanilla extract in a large mixing bowl until creamy. Add eggs one at a time, beating well after each addition.

Gradually add flour mixture.

Stir in the morsels.

Scoop dough into bar pan or spoon onto ungreased baking sheet.

Bake for about 10 min, depending on your oven.

Once bars are golden brown and not gooey then place half a marshmallow on each bar and place back in the oven for about 2-4 minutes.

Allow bars to cool in pan on a wire rack before removing from pan.