Hot Cocoa Cookies

Saw these on Pinterest and I'm making these for a Christmas Ugly Sweater party. I have been eating the weird looking ones or the ones that fell apart and they are good. 

Ingredients

1 cup butter, softened
1½ cups white sugar
2 eggs
2 teaspoons vanilla extract
2 cups all-purpose flour
2/3 cup cocoa powder
3/4 teaspoon baking soda
1/4 teaspoon salt
2 cups semisweet chocolate chips 
2 cups mini marshmallows

Directions

1. Preheat oven to 350 degrees
2. In large bowl, beat butter, sugar, eggs, and vanilla until light and fluffy.
3. Combine the flour, cocoa, baking soda, and salt

4. Stir into the butter mixture until well blended
5. Mix in the chocolate chips
6. Drop by rounded teaspoonfuls onto ungreased cookie sheets
7. Bake for 8 to 10 minutes in the preheated oven, or just until set
8. Immediately top with three mini marshmallows when you remove the cookies from the oven
9. If more gooey marshmallow is desired place marshmallow topped cookies back in the oven for 1 mintute
10. Cool slightly on the cookie sheets before transferring to wire racks to cool completely