Marinate the Chicken
Slice each chicken breast in half horizontally, or use whole thighs.
In a bowl or bag, whisk olive oil, lemon juice, Dijon, garlic, oregano, salt, and pepper.
Add chicken, coat well, and marinate 10–30 minutes at room temperature (or up to 2 hours in fridge).
Remove from fridge 10–15 minutes before grilling.
Prepare the Caesar Dressing
In a small bowl, whisk mayonnaise, egg yolk (if using), lemon juice, Dijon, minced anchovy or paste, and garlic.
Whisk in 2–3 tbsp Parmesan and then slowly drizzle in olive oil until smooth and creamy.
Season with salt and pepper; chill until ready to toss the salad.
If you like a vegetarian version, skip anchovies and use 1 extra tsp Dijon + dash of Worcestershire (or capers).
Make the Garlic Croutons (Optional on Grill or Oven)
Cut crusty bread (sourdough) into ¾–1 inch cubes.
Toss with olive oil, 1 minced garlic clove, salt, and pepper.
Spread on a baking sheet and bake at 400°F (200°C) 10–15 minutes, tossing once, until golden and crisp.
Alternatively, spread on a sheet pan and place on the grill for a smoky, grilled‑crouton flavor.
Grill the Chicken
Preheat grill to medium‑high (about 400°F / 200°C); oil the grates lightly.
Grill chicken 7–9 minutes per side (for ½‑inch breasts) or 5–7 minutes per side for thighs, until internal temperature reaches 165°F.
Transfer to a plate, tent with foil, and rest 5–10 minutes, then slice.
Prepare the Romaine (Optional Grilled)
Slice romaine hearts in half lengthwise, keeping the core intact.
Brush cut sides lightly with olive oil and season with salt and pepper.
Grill 1–2 minutes per side over medium heat, cut side down, until lightly charred.
Let cool slightly, then chop or serve halves on the plate.
Assemble the Salad
In a large bowl, combine romaine (grilled or raw) with half of the Parmesan and croutons.
Add about ½–⅔ of the dressing and toss gently, adding more as needed but not drowning the salad.
Divide among plates and top with sliced grilled chicken.
Drizzle extra dressing over the chicken, top with remaining Parmesan and a crack of black pepper.