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DIRECTIONS:
1. Preheat and Prepare: Preheat your oven to 375°F (190°C). Grease a 9x13-inch baking dish and set aside.
2. Cook Vegetables: In a large skillet, melt butter over medium heat. Add onion, bell pepper, celery, and garlic. Cook until softened, about 5-7 minutes.
3. Make Sauce: Stir in flour and cook for 2 minutes, stirring constantly. Gradually whisk in milk and chicken broth until smooth. Cook until thickened, about 5 minutes. Season with Old Bay seasoning, salt, and pepper.
4. Add Seafood: Gently fold in crabmeat and shrimp, ensuring they are evenly coated with the sauce.
5. Assemble Casserole: Transfer the mixture to the prepared baking dish. Sprinkle with cheddar cheese and breadcrumbs.
6. Bake: Place in the oven and bake for 25-30 minutes, or until bubbly and golden brown.
7. Garnish and Serve: Let cool slightly before garnishing with chopped parsley and serving.
This casserole is perfect for any occasion and will make your dinner table feel extra special. Enjoy every delicious bite! 
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