The Perfect Dulce de Leche Donuts

Name: "Bakery Dream" (fried pastry balls with sweet filling)
Yield: 0
Cuisine: spanish
Ingredients: 1 cup warm milk; 2 teaspoons dry yeast; 4 cups whole wheat flour; 1/4 cup sugar; Salt; 2 eggs; 1/4 cup butter, room temperature; 1 teaspoon vanilla extract; 1 cup powdered sugar; 1 1/2 cups dulce de leche