Banana Cream Pie Doughnuts

INGREDIENTS

Banana, medium

Egg yolk, large

1 (1/4-oz) package Active dry yeast

3 1/4 cups

All-purpose flour plus additional for sprinkling and rolling out dough

1/2 cup

Brown sugar, lightly packed

1/4 tsp

Cinnamon

1/4 cup

Cornstarch

3 tbsp

Powdered sugar

1 3/4 tsp

Salt

2 pinches

Salt

2 tbsp

Sugar

1 tsp

Vanilla extract, pure

splash Vanilla extract, pure

6 cups

Vegetable oil

6 tbsp

Butter, unsalted

1 1/2 cups

Double creme

2 cups

Whole milk

2 tbsp

Water