Cream Filling & Chocolate Glaze for Boston Cream Pie

I believe the idea here is to use a regular yellow cake mix for the cake part

CREAM FILLING FOR BOSTON CREME PIE & CHOCOLATE GLAZE
1/3 c. sugar
2 tbsp. cornstarch
1/8 tsp. salt
1 1/2 c. milk
2 egg yolks, slightly beaten
2 tsp. vanilla

Mix sugar, cornstarch and salt in 2 quart saucepan. Stir in milkgradually. Cook over medium heat, stirring constantly until mixturethickens and boils. Boil and stir 1 minute. Stir 1/2 of hot mixtureinto egg yolks in saucepan, boil and stir 1 minute. Remove from heat,stir in vanilla. Cool to room temperature.

CHOCOLATE GLAZE:
2 (1 oz.) squares unsweetened chocolate
3 tbsp. butter
1 c. powdered sugar
3/4 tsp. vanilla
Heat over low heat until melted. Remove from heat. Stir in 1 cuppowdered sugar and 3/4 teaspoon vanilla. Stir in 1 teaspoon hot waterat a time until desired consistency (about 2 tablespoons of water isneeded).