Make the ganache: Chop the chocolate into very small pieces and place in a small bowl. Warm the heavy cream up in the microwave in 20 second increments until hot, but not boiling. Approx. 40-50 seconds worked for me.
Pour the cream over the chocolate and allow it to sit for a few minutes and then stir it until the chocolate is melted and its smooth. If your chocolate won't completely melt, pop it in the microwave for another 5ish seconds and then stir.
Chill the mixture for about 20-30 minutes or so to allow it to set enough that you can scoop
When it is set, spoon about 24 equal small dollops (approx. 1 tsp ganache) onto a parchment lined baking pan. Freeze for about 30 minutes to allow them to really set well. You can roll them into nice balls if preferred once they are set enough in the freezer but it doesn’t have to be perfect.
Prepare the cookies: Preheat the oven to 350°F. Add the flour, espresso powder, cocoa powder, salt, baking soda and baking powder to a medium bowl and whisk to combine.
In a separate bowl, or in the bowl of a stand mixer, beat the butter, brown sugar and regular sugar on medium-high until light and fluffy (this should take about 3-4 minutes). Add the eggs and vanilla extract and beat until incorporated.
Add the 1/3 of the flour mixture at a time and beat on low speed until mixed in. Make sure not to over mix at this time.
Scoop approx. 2 Tbsp cookie cookie dough and roll into balls. Press with thumb into the center to make a cavity to fit a ganache piece and place it inside. Cover the ganache completely with the cookie dough. Arrange on a parchment lined pan.
Bake cookies for about 8-11 minutes or until the edges are set and the top is a bit puffy but not wet.
Remove the cookies from the oven and use a biscuit cutter or cookie cutter to scoot the cookies into nice even circles–totally optional but makes them so pretty! Cool for several minutes before transferring to a wire rack to finish cooling. Once cooled, sift some powdered sugar over top for a molten lava cake look.