Completely thaw turkey breast, if frozen (make sure turkey is free of any ice). Preheat oil to 375°F.
Rinse turkey well with warm water. Dry turkey with paper towels. Inject 4 oz marinade into each side of breast. Sprinkle outside generously with Cajun Seasoning(your preferred brand).
Place turkey, breast side up, in basket. Slowly lower basket into hot oil; be cautious of splattering oil.
Reduce temperature to 325°F. Fry turkey for 7 minutes per lb. (Example: 6 lb turkey breast, 6 X 7=42 minutes)
Remove from oil to check doneness. Insert an instant-read thermometer; it is done when it reads 170°F.
Remove from oil and drain on paper towels. Let rest 15 minutes. Carefully carve with sharp knife.