Pat the turkey breast dry with paper towels and let it sit at room temperature for 20 minutes before cooking. Drying the surface and bringing the meat closer to room temperature promotes even cooking and helps the spice rub adhere.

Make the Cajun rub: in a small bowl combine smoked paprika, garlic powder, onion powder, cayenne, kosher salt, black pepper, dried thyme and dried oregano. Mix thoroughly to distribute the cayenne and salt evenly—this ensures every bite has balanced flavor rather than pockets of heat or salt.

Brush the turkey all over with 1 tablespoon olive oil (this helps the spices stick and promotes browning). Massage half the rub into the turkey, pressing it into the surface. Let it rest on a plate for 10 minutes to allow the spices to hydrate and form a paste—this encourages a crust during roasting.

Preheat the oven to 375°F (190°C). Place a rack in a shallow roasting pan or rimmed baking sheet. A moderate oven lets the exterior brown without drying the lean turkey breast; it’s a balance between color and juiciness.

Heat an ovenproof skillet (cast-iron preferred) over medium-high heat with the remaining 1 tablespoon olive oil and 1 tablespoon butter until shimmering. Sear the turkey breast 2–3 minutes per side until deeply golden (including the ends). Searing develops the Maillard crust which adds richness and flavor to the finished dish.

Transfer the skillet (or move the turkey to the prepared pan) and dot the top with the remaining 1 tablespoon butter. Scatter any remaining dry rub over the top. Roast in the preheated oven until an instant-read thermometer inserted into the thickest part reads 160°F (71°C), about 45–65 minutes depending on thickness. Turkey is done at 160°F because residual carryover will bring it to the safe serving temperature of 165°F while resting.

Remove the turkey to a cutting board and loosely tent with foil. Rest for 10–15 minutes. Resting allows juices to redistribute and carryover cooking to finish the turkey; carving too soon will let juices run out and leave the meat dry.

While the turkey rests, make the pan sauce: return the skillet to medium heat (if you used a different pan, place it on medium heat and add 1 teaspoon butter). Add the minced shallot and sauté 1–2 minutes until softened—this releases sweet, aromatic flavors that form the sauce's base. Scrape up the brown bits (fond) with a wooden spoon; they’re full of concentrated flavor.

Deglaze with the white wine, simmer 1–2 minutes to reduce by half (this burns off harsh alcohol and concentrates flavor). Add the chicken stock and simmer until reduced by about one-third, about 3–5 minutes. Stir in the lemon juice and a small pat of butter to finish; the acid brightens and the butter gives the sauce glossy texture and mouthfeel.

Slice the rested turkey across the grain into 1/4–1/2-inch thick slices. Spoon the pan sauce over the slices and sprinkle with chopped parsley. Slicing across the grain shortens the muscle fibers and makes each bite tender; finishing with sauce and herbs adds moisture and freshness.

Serve immediately with roasted vegetables, creamy mashed potatoes, or rice. Leftovers keep well and make excellent sandwiches or gumbo-style additions.