Slow Cooker Stuffing

INGREDIENTS

• 1 cup butter or margarine
• 2 cups chopped onion
• 2 cups chopped celery
• 1/4 cup chopped fresh parsley
• 12 ounces sliced mushrooms
• 12 cups dry bread cubes
• 1 teaspoon poultry seasoning
• 1 1/2 teaspoons dried sage
• 1 teaspoon dried thyme
• 1/2 teaspoon dried marjoram
• 1 1/2 teaspoons salt
• 1/2 teaspoon ground black pepper
• 4 1/2 cups chicken broth, or as needed
• 2 eggs, beaten