Bierock Casserole | America's Test Kitchen

Ingredients

• 1 cup whole milk
• 1 tablespoon instant or rapid-rise yeast
• 2 tablespoons sugar
• 2 cups (10 ounces/283 grams) all-purpose flour
• 1 3/4 teaspoons baking powder
• 1/2 teaspoon salt
• 2 tablespoons unsalted butter, melted
• 1 tablespoon vegetable oil
• 3 pounds 85 percent lean ground beef
• 1 small head green cabbage, cored and chopped fine (8 cups)
• 2 onions, chopped fine
• Salt and pepper
• 1 tablespoon all-purpose flour
• 6 ounces (170 grams) American cheese, chopped
• 2 tablespoons yellow mustard
• 1 large egg beaten with 1 tablespoon water