Homemade Bavarian Cream Donuts - Better Than Bakery

Ingredients

• 3 cups all-purpose flour.
• ¼ cup white sugar.
• ½ teaspoon salt.
• 1 cup lukewarm milk.
• 1 egg, beaten.
• 2 tablespoons melted butter.
• 2 teaspoons instant dry yeast.
• 2 cups corn oil or canola oil (for frying).
• ½ cup powdered sugar.
• ¼ cup cornstarch (optional).
• ⅔ cup sugar.
• 3 tablespoons cornstarch.
• 4 egg yolks.
• 2 cups fresh milk.
• 1 tablespoon butter.
• 1 teaspoon vanilla extract.