In a bowl over simmering water, melt the 3 1/4 cups chocolate chips and butter together.
Meanwhile, in another bowl, mix together the flour, baking powder, and salt.
In a mixer with a whip attachment, mix the eggs and sugar until light and fluffy. Add the vanilla and ground espresso, then add the chocolate mixture. Mix in the dry ingredients and the remaining 1 1/2 cups chips. Let sit at room temperature for 30 minutes to set up.
Scoop onto parchment lined sheet pans with a medium ice cream scoop then freeze. Bake from frozen in a preheated 375 degree F for 7 minutes. You can par-bake them for 5 minutes then bake an additional 2 minutes at the time you serve them so they're warm.