Banana Pudding with Vanilla Wafer Crumble

Name: Banana Pudding with Vanilla Wafer Crumble
Ingredients: 5 large egg yolks; 1/4 c. cornstarch; 1/2 c. sugar; 2 tsp. sugar; salt; 2 c. whole milk; 3 tbsp. banana liqueur; 2 tbsp. cold unsalted butter; 1 tbsp. melted butter; 2 tsp. pure vanilla extract; 15 vanilla wafer cookies; 1/4 tsp. cinnamon; 2 bananas