it's brat to me casserole

Ingredients

• 1 pound bratwurts
• 2 pounds o'brien hash brown potatoes, frozen
• 1/2 cup butter, melted
• 1 can condensed cheese soup
• 1/2 cup onion, chopped
• 8 ounces sour cream
• 2 cups sharp cheddar cheese, grated
• 2 cloves garlic, minced
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 1/8 teaspoon celery seed, ground
• 1 - sleeves ritz crackers, crushed with 1/4 cup melted butter