Morehart'S Clam Chowder

Ingredients

• 6 large potatoes, cubed
• 1 (8 ounce) package sliced fresh mushrooms
• 1 yellow onion, chopped
• 1/2 green bell pepper, minced
• 2 quarts half-and-half
• 5 (6 ounce) cans clams in clam juice, undrained
• 2 (10.75 ounce) cans condensed cream of mushroom soup (such as Campbell's(R))
• 1/2 cup butter
• 1 tablespoon chopped parsley
• salt and ground black pepper to taste
• 1 pinch seafood seasoning (such as Old Bay(R)), or to taste