In a large bowl, whisk the pancake mix and cocoa together until well blended.  Then add the yogurt and 2 cups of the water until just until blended.  If needed, add the extra 1/4 cup water.  The amount of water will vary depending on the type of yogurt and pancake mix you use.  You want the pancake mix to be on the thick side to hold the chocolate chips.

Fold in the chocolate chips.  Pour onto a hot greased skillet over heat just below medium.  Cook pancakes until puffed and dry around the edges, then turn and cook other side.

Serve topped with strawberries and sweetened whipped cream.  Makes 10-12 large pancakes.