1Heat oven to 350°F. Spray 9-inch glass pie plate with cooking spray. In small bowl, mix bananas and lemon juice; set aside.
2In medium bowl, stir Bisquick mix, sugar, butter, 2 tablespoons of the rum, the condensed milk and eggs until blended. Add banana mixture; stir until blended. Pour into pie plate.
3Bake 35 to 40 minutes or until center is set. Cool completely on cooling rack, about 1 hour. Cover; refrigerate 2 hours or until well chilled.
4Spread whipped topping over pie to within 1/2 inch of edge. In small microwavable bowl, microwave dulce de leche uncovered on High 30 to 45 seconds or until thoroughly heated; stir in remaining 1 tablespoon rum. Drizzle over pie. Garnish with cookies. Store covered in refrigerator.