Preheat oven to 350 degrees; line baking sheet with parchment paper.
In a large mixing bowl, mix together butter and sugars until smooth.
Add eggs one at a time; stir in vanilla.
In a small dish, dissolve baking soda in hot water; add to batter.
Add salt and flour egg mixture.
Stir in chocolate chips, candy bars, and marshmallows.
Use a small cookie scoop to drop dough two inches apart.
Bake for 10 minutes; transfer to wire rack.