Hot Cocoa Cookies

0 In a saucepan, melt the butter and chocolate chips, stirring frequently, over medium heat. 
1 In another bowl, whisk together the flour, cocoa powder, baking powder and salt. 
2 In a large bowl, beat the sugar, eggs, and vanilla using an electric mixer at low speed. Mix in the cooled chocolate mixture until blended. Add the flour mixture slowly. 
3 Cover the dough and refrigerate for about an hour. 
4 Line a baking sheet with parchment paper. Scoop your dough and roll between your palms to form cookie balls. Bake at 325 F for 11 minutes or until the tops of the cookies crack. (I like to slam the pan down on the counter to help it get that crackly top) 
5 Meanwhile, cut marshmallows in half crosswise and stick on top of your cookie. Place back in the oven and bake until the marshmallows are just softened. 
6 Remove from the oven, let cool, and enjoy!