Creating Chocolate Marshmallow Cookies can be straightforward if you follow these simple steps:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C). Line baking sheets with parchment paper.
2. Cream Butter and Sugars: In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
3. Add Eggs and Vanilla: Beat in the eggs one at a time, then stir in the vanilla extract until fully combined.
4. Mix Dry Ingredients: In another bowl, whisk together the all-purpose flour, cocoa powder, baking soda, and salt.
5. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
6. Add Chocolate Chips: Fold in the semi-sweet chocolate chips and mini marshmallows until evenly distributed.
7. Scoop Dough: Using a cookie scoop or tablespoon, drop cookie dough onto the prepared baking sheets, spacing them about 2 inches apart.
8. Bake: Place in the preheated oven and bake for 10-12 minutes, or until the edges are set and the tops look slightly cracked.
9. Cool: Remove from the oven and let the cookies cool on the baking sheets for about 5 minutes before transferring them to wire racks to cool completely.

These steps will guide you in creating these incredible cookies effortlessly.