Really Good Scalloped Potatoes

INGREDIENTS

• 1 (10.75 ounce) can condensed Cheddar cheese soup
• 2 cups half-and-half cream
• 2 tablespoons herb and garlic flavored cream cheese spread
• 2 tablespoons dehydrated onion flakes
• 2 tablespoons garlic powder
• 2 tablespoons mustard powder
• 1 tablespoon chicken bouillon granules
• salt and pepper to taste
• 6 large baking potatoes, peeled and thinly sliced
• 3 cloves garlic, minced
• 2 stalks celery, thinly sliced
• 1 1/2 cups shredded Cheddar cheese
• 1/2 cup grated Parmesan cheese