Creating Hot Chocolate Cookies is simple and will fill your kitchen with a wonderful aroma. Follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
2. Mix 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 well combined.
4. Combine Dry Ingredients: In a separate bowl, whisk together the flour, cocoa powder, baking soda, and salt.
5. Mix Dry and Wet Ingredients: Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.
6. Fold in Chocolate Chips: Gently fold in the chocolate chips and mini marshmallows, ensuring they are evenly distributed throughout the dough.
7. Scoop the Dough: Use a cookie scoop or tablespoon to drop rounded balls of dough onto the prepared baking sheet, spacing them about 2 inches apart.
8. Bake: Bake in the preheated oven for 10-12 minutes, or until the edges are set and the cookies look slightly underbaked in the center.
9. Cool: Remove from the oven and allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

With these clear instructions, you will have perfectly baked Hot Chocolate Cookies in no time.