Banana Custard Filling

• sugar↗2 1⁄2 cups
• all-purpose flour↗1⁄2 cup
• cornstarch↗1⁄4 cup
• milk↗7 cups
• egg yolks↗4

  beaten

• butter↗1⁄4 cup

  softened

• vanilla extract↗1 teaspoon
• medium bananas↗9

  mashed

Step-by-step instructions

1. 1

   Combine sugar, flour, and cornstarch in a medium mixing bowl.

2. 2

   Mix well and set aside. Pour milk into a large saucepan, cook over medium heat until candy thermometer registers 160 degrees.

3. 3

   Gradually stir one fourth of the hot milk into yolks, stir into reserved dry ingredients, and add remaining hot milk.

4. 4

   Cook stirring constantly until mixture thickens and coats the spoon. Remove from heat and stir in butter, vanilla, and bananas.

5. 5

   Let cool to room temperature.