Ground Beef Wellington Recipe

Ingredients

• 1/2 cup chopped fresh mushrooms
• 1 tablespoon butter
• 2 teaspoons all-purpose flour
• 1/4 teaspoon pepper, divided
• 1/2 cup half-and-half cream
• 1 large egg yolk
• 2 tablespoons finely chopped onion
• 1/4 teaspoon salt
• 1/2 pound ground beef
• 1 tube (4 ounces) refrigerated crescent rolls
• Lightly beaten egg, optional
• 1 teaspoon dried parsley flakes