Mix the spice rub: In a small bowl, combine smoked paprika, sweet paprika (if using), garlic powder, onion powder, dried oregano, 1 teaspoon kosher salt, and several grinds of black pepper. Stir to blend.
Season the chicken: Pat the chicken dry with paper towels.
Sprinkle the spice mixture all over, pressing gently so it adheres. Let it sit while you prep the aromatics.
Heat the pan: Set a large skillet over medium-high heat. Add 1 tablespoon olive oil.
When it shimmers, add half the chicken in a single layer. Sear 3–4 minutes per side until well browned. Transfer to a plate and repeat with remaining oil and chicken.
Soften the aromatics: Reduce heat to medium.
Add the butter (if using), then the sliced onion with a pinch of salt. Cook 3–4 minutes, stirring, until softened and lightly golden. Stir in the garlic and cook 30 seconds until fragrant.
Build the sauce: Pour in the chicken broth and crushed tomatoes, scraping up any browned bits.
Add lemon juice. If using roasted red pepper or olives, stir them in now. Bring to a gentle simmer.
Finish the chicken: Return the chicken and any juices to the skillet.
Reduce heat to medium-low. Simmer 5–7 minutes, uncovered, until the chicken is cooked through and the sauce slightly thickens. If you want a creamier finish, stir in the cream during the last 2 minutes.
Taste and adjust: Add a pinch more salt, pepper, or lemon juice as needed.
The sauce should taste smoky, savory, and bright.
Garnish and serve: Sprinkle with chopped herbs. Serve hot with your favorite side—rice, potatoes, couscous, or charred bread are all great.