Mashed Casserole

Ingredients

• 2 bacon strips, diced
• 1 pound ground beef
• 1 3/4 cups fresh mushrooms, sliced
• 1 large onion, finely chopped
• 1 large carrot, finely chopped
• 1 celery rib, finely chopped
• 2 tablespoons all-purpose flour
• 1 cup beef broth
• 1 tablespoon Worcestershire sauce
• 1 teaspoon dried tarragon
• 1/4 teaspoon pepper
• 3 cups mashed potatoes, hot
• 3/4 cup cheddar cheese, shredded and divided
• paprika, to taste