Homemade Payday Candy Bars

° 220 gram dark chocolate
° 4 tbsp butter
° 2/3 cup flour 86 gram
° 1/2 tsp bakiing powder
° 1/2 tsp coffee tsp. to c.
° 2 large eggs
° 3/4 cup brown sugar 170 gram
° 1 Cup pure vanilla coffee
° 340 gram chocolate chips