In medium skillet, heat 2 tablespoons butter over medium-high heat. Add onion, celery, garlic and pepper; sauté until softened (about 3-5 minutes).
Transfer to a food processor or blender. Add crabmeat, crackers, egg, half & half and Old Bay seasoning; pulse until finely chopped and it comes together. Melt remaining 2 tablespoons butter.
Brush baking sheet with butter; place fillets on baking sheet; lightly brush fillets with butter and sprinkle with additional Old Bay seasoning. Spoon crab stuffing over fillets; brush remaining butter over stuffing and sprinkle with additional Old Bay seasoning.
Bake in a preheated 425°F oven 10-12 minutes or until fish flakes easily with a folk and stuffing is cooked through and lightly browned.
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