Combine Knorr® Cream of Leek recipe mix with water in small saucepan with wire whisk. Bring to a boil over medium heat, stirring constantly. Reduce heat to low and simmer 2 minutes. Remove from heat, then stir in cream; set aside.
Preheat oven to 400°F (200°C). Line 2 baking sheets with parchment paper.
Combine flour, baking powder and pepper in large bowl. Stir in cheese. Stir in soup mixture and stir until mixture just holds together