Whisk 2 ½ cups milksweetened condensed milk2 eggs and cornstarch in medium saucepan until well combined. Heat mixture over medium heatstirring constantlyuntil it reaches a boil. Reduce heat to low; cookstirring constantlyfor 5 minutes or until thickened. Remove from heat; add vanilla extract. Let cool at room temperature. Add bananas; set aside.
Combine remaining 2 eggsremaining 1 ¼ cup milkflour2 tablespoons butter and salt in medium bowl. Whisk until well combined. Heat 10-inch skillet over medium heat. Brush with a thin coat of remaining 2 tablespoons butter. Pour ¼ cup crêpe batter into skillet and rotate skillet so the batter forms a thin layer over bottom of skillet. Cook for 1 to 2 minutes. Turn crêpe over; cook for 10 seconds. Repeat to make 10 crêpes total. Fill each crêpe with about ½ cup filling. Roll crêpes; set aside. Top with Abuelita Sauce; serve immediately.
Combine Abuelita and media crema in small saucepan. Heat over medium heatstirring frequentlyuntil melted and smooth.