In a bowl add the flour, cocoa powder, baking powder, salt, espresso powder, and sugar, mix until well combined. Set aside
In a microwave safe bowl add the chocolate, the butter and the oil. Microwave on high for 30 seconds, stir and repeat until melted. Don't over heat or the chocolate will seize.
Stir in the beer.
Add the chocolate mixture, egg and yolk to the dry ingredients and stir until just combined, some lumps are OK.
Cover and refrigerate until the dough as has set, about 1 hour and up to 36.
Preheat oven to 350.
Add the pretzels and brown sugar in a food processor. Process until pretzels are broken up but large pieces still remain.
Using a cookie dough scoop, make balls just a bit smaller than golf balls, roll into shape with your hands. Place dough balls into pretzel mixture, press until pretzels are coated.
Line a baking sheet with parchment paper, add cookie balls
Bake cookies at 350 for 8-10 minutes or until the edges have set but the center is still soft. Cookies will firm up as they cool. Don't over-bake or the cookies will be dry and crumbly.