NO BAKE Boston Cream Cake How to make a Boston Cream Cake without oven. Quick and easy dessert you can serve to your friends and family. Here's what you'll need: CUSTARD CREAM FILLING: 1 can sweetened condensed milk (390g) 5 egg yolks 1 and 1/2 cup evap milk or fresh milk (370ml) 1 tsp vanilla extract (5ml) 2 tbsps salted or unsalted butter (30g) 1 and ½ cups heavy cream (375ml) or all purpose cream (chilled overnight) 250-300 grams graham crackers 1 tbsp instant coffee and 1 cup hot water (250m