In a large mixing bowl, add freshly brewed coffee, oil, eggs, sour cream and mix until smooth.
Add chocolate cake mix powder and mix until just combined. A few lumps are fine.
In a small bowl, add mini chocolate chips and 1 tablespoon all-purpose flour and toss until chocolate chips are coated.
Stir in mini chocolate chips gently in the cake batter with a spatula until evenly distributed.
Pour batter in 12 greased and floured mini bundt cake pans (Dimensions: 4 x 1.75 inches). If you want taller cakes, fill only 11 pans.
Bake at 350 degrees F for 15-20 minutes or until an inserted toothpick comes out clean.
Let the cakes cool in the pans for 10 minutes.
Run a thin spatula around the edge of the cakes to loosen them.
Turn the pans upside down onto a cooling rack and remove pans.
Allow the cakes to cool completely.
While the cakes are cooling, prepare the frosting.
Fill a piping bag with icing and attach a round tip (Wilton Tip # 12) and ice lines, starting from the side of the cake, moving to the center. Fill the central hole with icing at the end.
Toss some mini chocolate chips for decoration and enjoy.