Creating Chocolate Marshmallow Swirl Cookies is straightforward and fun. Here’s how you can do it:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
2. Mix Dry Ingredients: In a bowl, combine the flour, cocoa powder, baking powder, baking soda, and salt. Whisk together until well mixed.
3. Cream Butter and Sugar: In a separate bowl, cream together the softened butter and granulated sugar until light and fluffy.
4. Add Egg and Vanilla: Beat in the egg and vanilla extract until fully incorporated.
5. Combine Mixtures: Gradually add the dry ingredient mixture to the wet ingredients, stirring until just combined. Be careful not to overmix.
6. Fold in Add-ins: Gently fold in the miniature marshmallows and semi-sweet chocolate chips.
7. Scoop the Dough: Use a cookie scoop or tablespoon to drop dough onto the prepared baking sheet, spacing them about 2 inches apart.
8. Bake: Place the baking sheet in the oven and bake for 10-12 minutes, or until the edges are set but the centers remain soft.
9. Cool on Sheet: Allow the cookies to cool for 5-10 minutes on the baking sheet before transferring them to a wire rack to cool completely.
10. Serve and Enjoy: Optionally, dust with powdered sugar before serving for added sweetness.

By following these steps, you’ll be well on your way to baking a batch of cookies that will impress everyone!