Delicious American twist on traditional Mexican conchas sweet bread

Ingredients

• 2 1/4 teaspoons active dry yeast
• 1/4 cup warm water
• 1/2 cup warm milk
• 1/3 cup sugar
• 1/3 cup unsalted butter, softened
• 1 teaspoon salt
• 2 eggs
• 4 cups all-purpose flour
• 1/4 cup unsweetened cocoa powder
• 1/3 cup all-purpose flour
• 1/2 teaspoon vanilla extract