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Preheat oven to 350 degrees and line baking sheet with parchment paper.
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Whisk flour, sugar, salt and baking soda in large bowl. In a medium bowl, Whisk eggs, buttermilk, molasses, and vanilla extract in medium bowl. Whisk in melted butter to the egg mixture.
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Add egg mixture to dry ingredients and stir until dough is evenly moistened. Stir in chocolate chips and marshmallows.
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Drop cookie dough by rounded tablespoonsful onto prepared sheet, spacing about a couple of inches apart.
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Bake cookies until golden brown and dry to the touch (about 15 minutes). Let cookies cool on sheets for 10 minutes before transferring to racks to completely cool.