1In medium bowl, stir together Bisquick mix, 1 cup milk and egg with whisk until well blended. Slowly stir in 1 cup chopped sandwich cookies.
2Heat griddle or skillet over medium-high heat (375°F). Grease with butter if necessary (or spray with cooking spray before heating). For each pancake, pour about 1/3 cup batter onto hot griddle. Cook about 3 minutes or until edges are dry and bubbles form on top. Turn; cook other side until golden brown. This should make about 5 medium-size pancakes.
3In small bowl, stir together powdered sugar and 2 tablespoons milk.
4To assemble, place 1 pancake on cake stand or plate. Drizzle with about 2 tablespoons powdered sugar mixture. Top with 1 tablespoon chopped sandwich cookies. Repeat layers with remaining pancakes and filling ingredients.