Step 1: Preheat oven to 350 degrees F (set oven rack to second-lowest position).
Step 2: Grease sides of a 15 x 10-inch jelly-roll pan or can use a 17 x 11-inch jelly roll pan, then line the bottom with parchment paper.
Step 3: In a medium saucepan combine the butter with brewed coffee and cocoa powder; heat stirring constantly over medium-low heat until the butter is melted and the mixture is thoroughly combined; mix in the sugar and vanilla until no sugar granules remain, then transfer to a large mixing bowl; cool for about 20 minutes.
Step 4: Whisk in eggs until combined then mix in the sour cream until blended.
Step 5: In a small bowl combine the flour with baking soda and salt then add to the chocolate mixture; beat or whisk until thoroughly blended (batter will be thin).
Step 6: Pour into the prepared jelly-roll pan then sprinkle the chocolate chips evenly over the top.
Step 7: Bake for 18-20 minutes (watch closely this cake will not take long to bake).
Step 8: Cool in the pan then frost as desired.
Step 9: Slice and serve from the pan.
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